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.
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.
Black Beauty: His Grooms and Companions, subtitled 'The Autobiography of a Horse', is narrated by a handsome black horse with a white star and one white foot. He grows up in a pleasant meadow under a kind master, Farmer Grey, and his mother Duchess teaches him to be gentle and good and to work willingly.
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.
Candide, ou l'Optimisme follows a guileless young man raised in the castle of the Baron of Thunder-ten-tronckh in Westphalia, where the tutor Pangloss teaches that this is the best of all possible worlds and that everything is for the best. Candide is kicked out of the castle for kissing the Baron's daughter Cunégonde behind a screen, and the rest of the tale tests Pangloss's doctrine against an avalanche of catastrophe.
Characters is a collection of brief sketches of recognizable social types: the dissembler, flatterer, chatterer, boor, complaisant man, reckless man, tactless man, mean man, show-off, coward, oligarchic sympathizer, late learner, slanderer and many others. Each sketch begins with a definition and then offers small scenes in which the type reveals himself through repeated behavior.
The Confessions is a prayer in thirteen books addressed to God, in which Augustine recounts his life up to his mother's death and then turns to philosophical reflection on memory, time and the creation narrative of Genesis. Books I to IX are autobiographical.
David Copperfield is the first-person autobiography of a novelist looking back on his life. David is born at Blunderstone in Suffolk six months after his father's death, on a night when his formidable great-aunt Betsey Trotwood storms out on learning he is not a girl.
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.
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.
Early Black Church Sermons and Addresses is an anthology concept rather than one single-author book: it gathers public religious speech from Black Christian leaders before 1950, using only public-domain sermons, convention addresses, ordination sermons, and printed appeals. Its center is the Black church as pulpit, school, refuge, protest platform, mutual-aid network, and political institution.
Early Christian Lives gathers late antique biographies of saints, monks and holy figures, often including Athanasius’ Life of Antony and Jerome’s lives of Paul, Hilarion and Malchus. These works do not present biography as neutral chronology.
Early Christian Writings: The Apostolic Fathers gathers short texts from Christianity’s formative generations after the apostles. The collection usually includes 1 Clement, the letters of Ignatius, Polycarp’s letter, the Martyrdom of Polycarp, the Didache, the Epistle of Barnabas, the Shepherd of Hermas, 2 Clement and fragments such as Papias or the Epistle to Diognetus, depending on edition.
The Essays volume is a selection from the Moralia, the miscellaneous body of some seventy-eight surviving treatises attributed to Plutarch, alongside his famous Lives. Where the Lives teach ethics through the example of great men, the Moralia address readers directly, offering practical moral philosophy in the form of lectures, letters, dialogues and consolations.
Montaigne called his pieces essais, 'trials' or 'attempts', and the word names both a method and a new literary genre. The book gathers 107 chapters in three books, ranging from one-page notes on thumbs, smells and names to the sprawling 'Apology for Raymond Sebond', which fills a sixth of the whole.
Bacon's Essays, or Counsels, Civil and Moral, grew over almost thirty years from a slim volume of ten pieces in 1597 to fifty-eight in the final edition of 1625, the text used here. Bacon borrowed the name essay from Montaigne, but where Montaigne explored himself at leisure, Bacon compressed observation into dense, balanced sentences meant for men of business and government.
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.
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.
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.
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.
Letters from a Stoic selects from Seneca’s Moral Letters to Lucilius, a sequence of philosophical letters that turn daily life into training for freedom. Seneca writes as an older adviser to a younger friend, but the letters are also exercises for himself.
This volume collects three of Aristophanes' comedies (contents vary by edition; a long-standing selection is The Acharnians, The Clouds and Lysistrata). The Acharnians (425 BCE), the earliest surviving comedy, is set in the sixth year of the Peloponnesian War.
Mansfield Park follows Fanny Price, the timid daughter of a poor, overburdened family in Portsmouth, who at ten is taken in by her wealthy aunt and uncle, Sir Thomas and Lady Bertram, at Mansfield Park in Northamptonshire. Her other aunt, the officious and mean Mrs Norris, never lets her forget her dependent status, and her cousins Tom, Maria and Julia treat her with indifference.
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.
Napoleon's Maxims of War is not a book Napoleon wrote but a compilation made by a French officer, General Burnod, who in 1827 published Maximes de guerre de Napoléon, drawn from the emperor's memoirs dictated on St Helena and other sources. The British officer George Charles D'Aguilar translated it into English in 1831, adding explanatory notes with examples from the campaigns of Gustavus Adolphus, Turenne, Montecuccoli, Frederick the Great and Napoleon himself.
Northanger Abbey follows Catherine Morland, the unremarkable seventeen-year-old daughter of a country clergyman, whom the narrator teasingly insists no one would have supposed born to be a heroine. Catherine is a devoted reader of Gothic novels, especially Ann Radcliffe's The Mysteries of Udolpho.
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 Liberty asks what limits there are on the power society may legitimately exercise over the individual. Mill opens by observing that the old struggle between subjects and rulers has been transformed by democracy.
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.
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.
This volume pairs one of Plato's most literary dialogues with two letters attributed to him. The Phaedrus takes place outside the walls of Athens, where Socrates, who rarely leaves the city, walks with the young Phaedrus along the river Ilissus and sits under a plane tree on a hot summer day.
Politics examines the polis as the community ordered toward living well. Aristotle begins with the household, including relations of master and slave, husband and wife, parent and child, and then argues that the city exists by nature because human beings possess speech about justice and advantage.
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.
Moody's Selected Sermons represent revival preaching after the Civil War, in the age of railroads, urbanization, mass meetings, gospel hymnody, and organized evangelistic campaigns. Moody's style is famously plain.
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.
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.
Testament of Youth is Vera Brittain's memoir of the years 1900 to 1925, centred on the First World War, written to show what the war meant to a generation of women. It begins with her provincial girlhood in Buxton, where she chafes against the expectations placed on a middle-class daughter, educates herself, and fights to be allowed to sit the entrance examination for Oxford.
Dell'arte della guerra, printed in Florence in 1521, is the only one of Machiavelli's political works published in his lifetime. It is a dialogue in seven books, set in 1516 in the Orti Oricellari, the shaded garden of Cosimo Rucellai, where the humanist circle that Machiavelli frequented met to discuss Livy and republican government.
The Arthashastra, the 'science of material gain' or of statecraft, is a vast Sanskrit treatise on how a king should acquire, protect and govern territory. Written mostly in prose with occasional verses, it is divided into fifteen books and some 150 chapters, and covers almost every aspect of administration with remarkable detail and an unsentimental realism that has led to comparisons with Machiavelli.
The Last Days of Socrates gathers four dialogues by Plato that together tell the story of Socrates' trial and death in Athens in 399 BCE: the Euthyphro, the Apology, the Crito and the Phaedo. In the Euthyphro, Socrates meets Euthyphro outside the court where Socrates must answer an indictment for impiety and corrupting the young.
The Nicomachean Ethics asks what the human good is and how a life can be shaped toward it. Aristotle begins from the idea that every craft, inquiry and action aims at some good, and that the highest practical good is eudaimonia, often translated happiness or flourishing.
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.
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 Rule of St Benedict is a concise manual for forming a stable monastic community. It opens by calling the monastery a school for the Lord’s service and asks what kind of person desires life.
The Secret Garden begins in imperial India, where Mary Lennox is a sickly, spoiled and emotionally neglected child. A cholera outbreak kills her parents and household, and Mary is sent to Misselthwaite Manor in Yorkshire to live with her reclusive uncle Archibald Craven.
The Symposium is a framed dialogue about eros, memory and ascent. Apollodorus repeats what Aristodemus told him about a banquet at Agathon’s house after the poet’s tragic victory.
Two Lives of Charlemagne pairs Einhard's Life of Charlemagne with Notker the Stammerer's later anecdotes about the emperor. Einhard writes as a court insider shaped by classical biography, especially Suetonius.
Utilitarianism is a short defence of the ethical theory Mill inherited from Jeremy Bentham and his own father. It was first published in three instalments of Fraser's Magazine in 1861 and as a book in 1863.
We Hold These Truths collects John Courtney Murray's essays on the American constitutional experiment, natural law, religious liberty, pluralism, and the conditions of civil conversation. Murray argues that the American order depends on moral truths that public argument must continue to articulate, not merely procedural agreement or private preference.