A Logical Calculus of the Ideas Immanent in Nervous Activity is a short paper with a long afterlife. McCulloch and Pitts propose an idealized model of neurons that fire or do not fire according to logical relations among their inputs.
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This entry joins Claude Shannon's 1938 master's thesis on relay and switching circuits with his 1948 paper A Mathematical Theory of Communication. The thesis made a decisive engineering move: it showed that Boolean algebra could describe and simplify relay circuits.
Hume subtitled his first book 'an attempt to introduce the experimental method of reasoning into moral subjects', and he meant it literally: as Newton had explained the heavens by a few observed principles, Hume would explain belief, emotion and morality by a few principles of the mind. Book I, Of the Understanding, begins by dividing all perceptions into vivid impressions and fainter ideas, and holds that every simple idea is copied from a prior impression.
Pinel presents insanity as a medical and moral problem rather than a condition to be met chiefly with chains, spectacle, or punishment. The treatise moves between nosology, institutional observation, and therapeutic counsel.
Hume first published this book in 1748 as Philosophical Essays Concerning Human Understanding, and gave it its present title in 1758. It is his deliberate second attempt at the material of Book I of the Treatise, written, he said, so that the argument would no longer fail through its manner.
Locke says in the Epistle to the Reader that the Essay began when five or six friends meeting in his rooms found themselves at a standstill over questions of morality and revealed religion, and he proposed that they first examine what objects human understanding is fitted to deal with. Nearly twenty years later the result was a long, patient survey of where ideas come from, how they combine, how words signify them and how far knowledge and probable belief can reach.
An Investigation of the Laws of Thought is George Boole's attempt to express logic, probability, and reasoning in mathematical form. The book begins from a bold premise: the operations of the mind in reasoning can be studied through symbols and laws analogous to those of algebra.
As We May Think is a speculative essay about the problem of intellectual abundance. Written at the end of World War II, it asks what scientists should do when their wartime energies turn toward peace and when the record of human knowledge has grown too large for traditional methods of indexing, filing, and retrieval.
Franklin's Autobiography and Poor Richard's Almanack present the founding era through self-fashioning, practical wisdom, and the culture of improvement. The Autobiography narrates Franklin's movement from Boston apprentice to Philadelphia printer, civic organizer, scientist, and public man.
Maudsley's Body and Mind argues that mental life cannot be separated from bodily organization, nervous function, heredity, and disease. Based on the Gulstonian Lectures, the book brings Victorian psychiatry, physiology, and evolutionary thought into one frame.
Kant's first Critique asks whether metaphysics is possible as a science, and answers by examining reason's own powers before trusting any of its claims about God, the soul or the world as a whole. The first-edition preface describes human reason as burdened by questions it cannot dismiss and cannot answer, and the second-edition preface proposes a Copernican experiment: instead of assuming that knowledge must conform to objects, suppose that objects must conform to the forms of our knowing.
Cybernetics presents one of the twentieth century's boldest attempts to unite machines, organisms, and societies under a single vocabulary of control, communication, feedback, and information. Wiener begins from wartime problems of prediction, especially the effort to anticipate the path of aircraft quickly enough for anti-aircraft fire.
De Anima asks what soul is by beginning with the observable powers of living things. Aristotle reviews earlier accounts from thinkers such as Democritus, Empedocles, Anaxagoras, and Plato, then rejects explanations that make soul either a wandering body, a harmony, or a separate passenger inside the organism.
De Materia Medica is an ancient pharmacopoeia: a systematic guide to plants, animals, minerals, wines, oils and manufactured preparations used as medicines. Dioscorides does not write a narrative.
Bleuler's Dementia Praecox or the Group of Schizophrenias reworks Kraepelin's deteriorating psychosis into a broader and more psychologically complex group of disorders. Its most famous act is terminological: Bleuler introduces schizophrenia to name a splitting or disjunction in psychic functions, not a split personality in the popular sense.
Destruction and Creation and the OODA Loop Briefings gather John Boyd's strategic thought from thermodynamics and epistemology to conflict, command, and adaptation. Destruction and Creation argues that organisms and organizations must break apart old mental concepts and rebuild new ones in order to cope with a changing reality.
Modelled on Cicero's On the Nature of the Gods, Hume's Dialogues are narrated by Pamphilus, a young man, to his friend Hermippus, and report a conversation at the house of Pamphilus's tutor, Cleanthes. Three speakers debate not whether God exists, which all profess to accept, but what can be known of God's nature by reason.
The Discourse on the Method of Rightly Conducting One's Reason and Seeking Truth in the Sciences was published anonymously in Leiden in 1637 as a preface to three scientific essays, the Dioptrics, the Meteors and the Geometry. Descartes wrote it in French rather than Latin so that readers using their natural reason, including women, could judge it without scholastic training, and he presented it not as a treatise but as a history or fable of his own mind.
Dracula is told through journals, letters, phonograph diaries, telegrams and newspaper cuttings assembled by its characters. Jonathan Harker, a young English solicitor, travels to Transylvania to arrange the purchase of a London property, Carfax, for Count Dracula.
Ethics Demonstrated in Geometrical Order is set out like Euclid: definitions, axioms, numbered propositions, proofs, corollaries and the discursive notes (scholia) where Spinoza speaks most freely. Its five parts lead from God to human blessedness.
Fathers and Sons is set in the Russian countryside in the spring and summer of 1859, two years before the emancipation of the serfs. Arkady Kirsanov, a newly graduated student, returns to his father's modest, poorly run estate, Maryino, bringing his friend and mentor Yevgeny Bazarov, a brusque, brilliant medical student of humble origins who calls himself a nihilist: he accepts no principle on authority and values only what is useful, especially natural science.
Fides et Ratio is John Paul II's 1998 encyclical on the relation between faith and reason. Its governing image is that the human spirit rises toward contemplation of truth by two wings, and the whole argument defends the compatibility and mutual need of revelation and philosophical inquiry.
First Draft of a Report on the EDVAC is not a polished monograph but a technical memorandum whose influence exceeds its form. Written in 1945 for the Electronic Discrete Variable Automatic Computer project, it describes a general-purpose electronic digital computer in which numerical data and operating instructions occupy the same high-speed memory.
Heraclitus's book does not survive; what remains are roughly 130 short sayings preserved as quotations by later authors such as Plato, Aristotle, Plutarch, Sextus Empiricus, Clement of Alexandria, Hippolytus and Diogenes Laertius. Modern editions number them according to Hermann Diels and Walther Kranz (DK), and the reference edition presents them in a fresh translation with commentary.
Frankenstein; or, The Modern Prometheus is a frame narrative told through the letters of Robert Walton, an English explorer whose ship is trapped in Arctic ice. Walton rescues a dying stranger, Victor Frankenstein, who has been pursuing a gigantic figure across the frozen sea, and who tells his story as a warning to a man whose ambition resembles his own.
Galen: Selected Works introduces a physician whose ambition was encyclopedic. The surviving Galenic corpus ranges from technical anatomy and pulse lore to philosophical defenses of method, from therapeutics and compound drugs to autobiography and polemic against rivals.
Kant's Grundlegung zur Metaphysik der Sitten (1785), translated by Abbott as Fundamental Principles of the Metaphysic of Morals, is a short book with a narrow and ambitious aim: to identify and establish the supreme principle of morality. It does not offer a full ethical system, which Kant postponed to the Metaphysics of Morals of 1797, but clears the ground by asking what must be true of moral obligation if it is to bind every rational being without exception.
Travels into Several Remote Nations of the World, by Lemuel Gulliver, presents itself as the sober memoir of a ship's surgeon. In Part I, shipwrecked, Gulliver wakes on the shore of Lilliput tied down by people six inches tall.
Hippocratic Writings is not a single book but a library of early Greek medicine: case histories, ethical rules, theoretical essays, surgical manuals, dietetic advice, aphorisms and polemics against rival healers. Its strongest works begin from the sickbed.
Frederick wrote the treatise known in English as Instructions for His Generals in the winter of 1746–1747, after the first two Silesian Wars had won and held the rich Austrian province of Silesia. Its French title was Les Principes généraux de la guerre; a German version, Die General-Principia vom Kriege, was printed in 1748 in a small number of copies for Prussian generals, who were bound to keep it secret.
Kraepelin's Lectures on Clinical Psychiatry introduces readers to psychiatric diagnosis through bedside cases and disease course. Rather than beginning with abstract definitions, the lectures proceed from patients: mood disturbance, excitement, confusion, delusions, hallucinations, deterioration, alcoholism, epilepsy, paralysis, dementia praecox, manic-depressive insanity, and other clinical groupings.
Charcot's lectures show clinical neurology becoming a public method: observe signs, localize lesions, correlate symptoms with anatomy, and teach by cases. The English volumes gather Salpetriere lectures on spinal cord disease, paralysis, tremor, sclerosis, locomotor ataxia, hysteria, epilepsy, and related nervous disorders.
Leviathan, or the Matter, Forme and Power of a Common-Wealth Ecclesiasticall and Civil was published in London in 1651, two years after the execution of Charles I, and its famous frontispiece shows a giant crowned sovereign whose body is made of hundreds of tiny subjects, holding a sword and a bishop's crozier above a peaceful town. The Introduction states the governing analogy: as art can make automata with springs for hearts and strings for nerves, so human art creates the commonwealth, an artificial man whose soul is sovereignty.
Leibniz's logical writings on binary arithmetic and universal character are scattered across essays, letters, drafts, and memoranda rather than gathered in a single finished book. Their unity lies in a dream: reasoning might be made clearer, more reliable, and more inventive by a symbolic language whose elements combine according to rules.
Medical Inquiries and Observations upon the Diseases of the Mind is often called the first American psychiatry textbook. Benjamin Rush gathers observations, classifications, causes, and treatments for mania, melancholy, hypochondria, derangement, moral faculties, memory, and related conditions.
Meditationes de prima philosophia, published in Paris in 1641, compresses Descartes's metaphysics into six meditations, each imagined as a day's reflection by a solitary thinker seated by the fire in a dressing gown. The book was issued with six sets of Objections from learned readers (Caterus, Mersenne's circle, Hobbes, Arnauld, Gassendi and others) and Descartes's Replies, which are longer than the Meditations themselves; a second edition (Amsterdam, 1642) added the Jesuit Bourdin's Seventh Objections.
Esquirol expands Pinelian alienism into a more elaborate clinical and institutional system. Mental Maladies surveys insanity as a family of disorders marked by disturbances of perception, judgment, passion, volition, and bodily function.
Griesinger gives nineteenth-century psychiatry a somatic and medical program. Mental Pathology and Therapeutics treats insanity as a disorder of the brain, even while admitting how little pathological anatomy could yet prove.
Natural History: A Selection introduces one of antiquity’s great encyclopedic minds. Pliny wants to collect nature and human use together: stars, lands, peoples, animals, plants, metals, pigments, stones, medicines, marvels and technologies all belong to one vast inventory.
Ada Lovelace's Notes on Menabrea's Sketch of the Analytical Engine begin as an act of translation and become a theory of computation. Luigi Menabrea had published a French account of Charles Babbage's proposed Analytical Engine after hearing Babbage lecture in Turin.
Jefferson's selected writings show the range and tensions of the revolutionary Enlightenment in America. Notes on the State of Virginia began as answers to questions from a French diplomat, but it became Jefferson's most sustained book: a survey of Virginia's geography, natural history, laws, economy, population, slavery, Indigenous peoples, education, religion, and politics.
The Novum Organum ('new instrument') is the second and only substantially completed part of Bacon's projected Instauratio Magna, a six-part plan to rebuild human knowledge from its foundations. Its title throws down a challenge to the Organon, the collection of Aristotle's logical works that had governed university teaching for centuries.
This paired entry brings together Alan Turing's 1936 paper On Computable Numbers, with an Application to the Entscheidungsproblem and his 1950 essay Computing Machinery and Intelligence. The first paper attacks a precise mathematical problem: what does it mean for a number or function to be computable?
On Formally Undecidable Propositions is one of the decisive works in the history of logic. Godel addresses the dream that mathematics might be placed on a complete and consistent formal foundation, a dream associated with Hilbert's program.
On Medicine, or De Medicina, is the most important surviving Latin medical work before late antiquity. Celsus organizes medicine into diet, drugs and surgery, giving Roman readers a lucid account of Greek medical learning without the dense polemic of specialist schools.
On the Making of Man is Gregory of Nyssa's theological anthropology, written as an extended reflection on Genesis and the claim that human beings are made in the image of God. Gregory combines scriptural exegesis, Platonizing philosophy, and late antique physiology to ask why humanity is embodied, rational, sexual, mortal, and capable of divine likeness.
On the Nature of the Universe, better known as De Rerum Natura, is a philosophical poem that tries to cure fear by explaining the world. Lucretius addresses Memmius and invokes Venus, then argues that religion has driven human beings to cruelty, as in the sacrifice of Iphigenia.
On the Origin of Species argues that species are not fixed, separately created kinds but populations changed over time by variation, inheritance, struggle, natural selection, and descent with modification. Darwin begins with variation under domestication, using pigeons, livestock, and cultivated plants to show how small differences can be preserved and accumulated.
On War (Vom Kriege) is an unfinished philosophical inquiry into the nature of war, written by a Prussian staff officer who had lived through the Napoleonic transformation of warfare. It is organised in eight books, but Clausewitz left a note in 1827 saying that only the first chapter of Book I satisfied him, and he was revising the whole when he died.
Passages from the Life of a Philosopher is Charles Babbage's late memoir of invention, public controversy, and scientific administration. It is not a continuous autobiography so much as a set of argued recollections.
The Pensées ('Thoughts') are the fragments of an unfinished apology for the Christian religion, found after Pascal's death in 1662 as nearly a thousand notes, many on slips of paper threaded together in bundles. Pascal had planned a work that would first unsettle the complacent unbeliever (the honnête homme of polite society) by showing the misery and contradiction of the human condition, then show that Christianity alone explains that condition and offers its remedy.
Newton's Principia sets out the mathematical principles of natural philosophy and shows that the same laws can explain terrestrial motion and celestial order. The work begins with definitions of mass, quantity of motion, inertia, impressed force, centripetal force, absolute and relative space, and absolute and relative time.
Psychopathia Sexualis is a medico-forensic taxonomy of sexual behavior written for physicians and lawyers. Krafft-Ebing organizes case histories under categories such as hyperaesthesia, anaesthesia, paraesthesia, sadism, masochism, fetishism, and contrary sexual feeling, using the language of degeneration, neuropathic heredity, and criminal responsibility.
The Regensburg Lecture, delivered by Benedict XVI in 2006 at the University of Regensburg, argues that Christian faith is intrinsically bound to reason and that the modern narrowing of reason endangers both theology and culture. Benedict begins with a contested quotation from a dialogue between the Byzantine emperor Manuel II Paleologus and a Persian interlocutor, then uses the controversy over faith and violence to introduce his larger claim: acting against reason is contrary to the nature of God.
Wesley's Sermons on Several Occasions and Primitive Physick make an unusually strong pairing for a medical classics library. The sermons define Methodist teaching on salvation, new birth, sanctification, practical holiness, the means of grace, Christian perfection, money, self-denial, and social responsibility.
St. Vitus and the Dancing Mania joins two histories that later language often confuses: the hagiographic cult of a youthful martyr and the medical naming of involuntary or epidemic movement.
Sts. Cosmas and Damian are the physician saints par excellence: twin or paired martyrs, healers without payment, patrons of doctors and surgeons, and subjects of one of medieval art's strangest surgical miracles.
Studies on Hysteria is the classic collaborative text from which psychoanalysis narrates much of its beginning. , followed by theoretical and therapeutic reflections.
The Summa Theologiae, traditionally called the Summa Theologica, is Aquinas's unfinished synthesis of Christian theology, written, as its prologue says, for beginners who were confused by the disorder and repetition of existing textbooks. It contains some 512 questions divided into about 2,600 articles, each built on the same disciplined form inherited from university disputation.
The Anatomy of Melancholy presents itself as a medical treatise, laid out in the scholastic manner of partitions, sections, members and subsections, on 'what it is, with all the kinds, causes, symptoms, prognostics, and several cures of it'. It is also an encyclopedia of Renaissance learning, a compendium of quotation from more than a thousand authors, a satire on human folly, and a consolation for its author and readers.
The Art of War is a short treatise of thirteen chapters, around six thousand Chinese characters, written as a sequence of terse sayings introduced by the formula 'Sun Tzu said'. It begins by declaring war a matter of life and death for the state, to be studied through five constant factors: the moral law that binds people to their ruler, heaven (weather and seasons), earth (terrain and distance), the commander's qualities, and method and discipline.
The Birth of Tragedy from the Spirit of Music, published in 1872 when Nietzsche was a twenty-seven-year-old professor at Basel, argues that Greek tragedy arose from the union of two opposed artistic drives, which he names after the gods Apollo and Dionysus. The Apollonian is the drive toward clear form, measure and individuation, whose physiological analogue is the dream, in which every person is a perfect artist of images.
The Call of Cthulhu and Other Weird Stories is a selection of Lovecraft's tales, edited with notes by the Lovecraft scholar S. T.
The Descent of Man applies evolutionary theory to human beings and develops Darwin's account of sexual selection. Darwin argues that humans share ancestry with other animals and that differences between human and animal mental faculties are differences of degree rather than absolute kind.
Darwin's Expression of the Emotions is one of the founding works of comparative psychology. It asks how humans and animals express fear, anger, joy, grief, shame, disgust, attention, and other states through face, posture, voice, tears, hair, muscles, and involuntary action.
Die Traumdeutung appeared in November 1899 with the date 1900 on its title page, and Freud regarded it as his most important book. Its central claim is that dreams are meaningful psychic acts that can be interpreted, and that every dream, properly analysed, proves to be the fulfilment of a wish.
The Journey of the Mind into God is Bonaventure's compact map of contemplative ascent, written after meditation on Francis of Assisi's vision of the six-winged seraph at La Verna. The work is structured around six stages, corresponding to the seraph's wings, by which the mind rises through creation, the self, and the names of God before passing beyond conceptual mastery into ecstatic union.
The Major Symptoms of Hysteria gathers Janet's Harvard lectures into a clear account of dissociation, narrowed consciousness, fixed ideas, amnesia, anesthesia, motor symptoms, crises, and suggestibility. Janet stands close to Charcot but less theatrical; he is interested in how psychological functions fall apart, become dissociated, or continue automatically outside ordinary awareness.
The Metaphysical Poets is Helen Gardner's anthology of English poets of the seventeenth century who wrote in the style that Samuel Johnson, borrowing a phrase from Dryden, called 'metaphysical'. Johnson complained that in their verse the most heterogeneous ideas were yoked by violence together; T.
The Narrative of Arthur Gordon Pym of Nantucket begins as a sea adventure told by a young Nantucketer whose craving for forbidden experience repeatedly overrides judgment. Pym and his friend Augustus Barnard first make a disastrous drunken voyage in the Ariel, a small boat nearly destroyed before rescue.
Les Passions de l'âme, published in Amsterdam and Paris in November 1649, was Descartes's last book and his fullest account of how mind and body interact in emotional life. It grew out of his correspondence with Princess Elisabeth of Bohemia, who in 1643 had asked him how an immaterial thinking soul could move a body, and who later pressed him on the regulation of grief and the good life.
The Principles of Psychology is a two-volume, 1,400-page textbook that William James spent twelve years writing for Henry Holt's American Science Series. It sets out to treat psychology as a natural science of mental life, studying feelings, desires, cognitions and decisions together with their bodily conditions, while refusing to reduce the mind to physiology or to dissolve it into atoms of sensation.
Jung's Psychology of Dementia Praecox attempts to make psychotic speech and behavior psychologically intelligible. Working from the Burgholzli clinic, word-association studies, Bleuler's dementia praecox, and Freud's ideas about complexes, Jung argues that seemingly senseless symptoms may express emotionally charged complexes.
The Republic begins with a question that never stays small: what is justice, and is the just life happier than the unjust? Socrates meets Cephalus, Polemarchus, Thrasymachus, Glaucon and Adeimantus in the Piraeus.
The Varieties of Religious Experience: A Study in Human Nature collects the twenty Gifford Lectures on Natural Religion that William James delivered at the University of Edinburgh in 1901 and 1902. Instead of studying churches, creeds or theology, James studies personal religious experience as a psychologist, drawing on a large collection of first-person documents: diaries, autobiographies, letters and replies to questionnaires.
The Voyage of the Beagle is Darwin's account of his five-year journey around South America, the Pacific, Australia, and the Atlantic aboard HMS Beagle. It is a travel book before it is an evolutionary treatise: Darwin describes landscapes, fossils, earthquakes, volcanoes, coral reefs, animals, plants, Indigenous peoples, imperial violence, slavery, disease, and the practical hardships of field observation.
Timaeus offers Plato's most elaborate cosmological account, framed by Socrates' wish to see the ideal city in motion and Critias's story of ancient Athens and Atlantis. Timaeus then delivers a likely story about the cosmos, not a demonstration with mathematical certainty.
We is presented as the diary or record of D-503, mathematician and builder of the spaceship Integral in the OneState, a glass-walled totalitarian society ruled by the Benefactor. Citizens, called Numbers, live by tables of hours, regulated labor, monitored sex, prescribed walks and transparent architecture.