Method of Medicine (De Methodo Medendi)

The Method of Medicine (De Methodo Medendi, conventionally cited as MM) is Galen’s longest surviving work and the fullest account of his therapeutic reasoning in his own words. Books I and II, which constitute the methodological introduction to the whole, were translated into English by R. J. Hankinson for the Clarendon Press in 1991 — the first English translation of any substantial portion of the text. The work opens with a sustained polemic against thessalus-of-tralles and the Methodist school and proceeds to erect a demonstrative method for therapy grounded in proper disease classification, causal analysis, and the axiom that therapy consists in restoring the body’s natural activities wherever they are impaired.

Place in Galen’s Corpus

galen was born at Pergamum in September of 129 CE and lived, on the current best estimate, until around 210 CE.(Galen (trans. R.J. Hankinson), 1991) He considered philosophy indispensable to medicine: “one could not be a good doctor unless one was versed in logic, physics, and ethics, the three traditional branches of the philosophical enterprise.”(Galen (trans. R.J. Hankinson), 1991) He was, by his own account, an adherent of no school, writing that he composed On the Best Sect not to champion one faction but to “excerpt the best teachings from all of them and to show how the truth was to be arrived at.”(Galen (trans. R.J. Hankinson), 1991) His method — which he described as an amalgam of Dogmatic and Empirical approaches — held that thorough knowledge of the body’s internal structure is a prerequisite for successful practice, while also insisting that empirical testing (peira) is an essential part of justification.(Galen (trans. R.J. Hankinson), 1991)

The MM was composed in two distinct phases. Hankinson dates the first six books to around 172–175 CE, addressed to Galen’s friend Hiero. The remaining eight were composed later in Galen’s life and addressed to Eugenianus, since “Hiero had already been dead for some considerable time.”(Galen (trans. R.J. Hankinson), 1991) The plan of the work divides into four sections: Books I–II are introductory and methodological; Books III–VI address illnesses common to both uniform and non-uniform parts of the body; Books VII–X deal with diseases of the uniform parts; and Books XI–XIV treat diseases of the non-uniform parts.(Galen (trans. R.J. Hankinson), 1991)

Medicine in Galen’s time was divided into three broad camps: the Empiricists, who built general statements from observed instances; the Dogmatists (also called Rationalists or the Logical school), who held that a physician must know the internal structure of the body inferred from signs; and the Methodists, who sought a middle path by reducing all disease to only three basic types — fluid, costive, and mixed.(Galen (trans. R.J. Hankinson), 1991)(Galen (trans. R.J. Hankinson), 1991)(Galen (trans. R.J. Hankinson), 1991) The MM is addressed primarily against the Methodists under Thessalus, but its full argument spans all three schools and concludes that doctors of every faction have failed to ground their practice in genuine demonstration.

The Polemic Against Thessalus

Galen opens Book I by lamenting the corruption of his contemporaries: “pretty well noone nowadays cares about the truth; rather they pant after money, political power, and the insatiable enjoyment of pleasures.”[galen-08_translation_-book_i-001] Thessalus exemplifies this corruption. He not only “cultivated the wealthy in Rome” but “promised to teach the art in six months,” attracting many pupils by declaring that physicians need no training in “geometry, astronomy, logic, music, or any of the other noble disciplines.”[galen-08_translation-book_i-002] In a letter addressed to the Emperor Nero, Thessalus wrote: “I have founded a new sect, which is the only true one, as none of the earlier doctors propounded anything advantageous either for the preservation of health or for the curing of disease.”[galen-08_translation-_book_i-003] For Galen, this was not merely professional rivalry; it was a direct assault on every authority medicine had produced.

Hankinson’s commentary places the polemic in social context: Thessalus is “the proper founder of the Methodist sect,” a man whose “social threat to the power and exclusiveness of traditional medicine no doubt underlies much of the polemic which follows, and lends it its peculiarly violent, bitter, and snobbish tone.”[galen-10_commentary_-book_i-003] But Hankinson insists that the critique is not mere snobbery: “Galen’s objections to Methodism are more than just the outraged conservatism of a threatened closed shop: they deserve to be treated with the theoretical seriousness they demand.”[galen-10_commentary-book_i-003] Galen further distinguishes two kinds of scientific dispute: agathe eris, a healthy competitiveness motivated by love of truth, and eris ponera, a destructive rivalry motivated by greed and the lust for reputation. Thessalus exemplifies the second variety.[galen-10_commentary-_book_i-008]

The core of Galen’s technical objection is that Thessalus confuses diseases with their differentiae: the Methodist “two types only of all diseases in the domain of regimen, namely the fluid and the costive” are merely differentiations, not the diseases themselves.[galen-08_translation_-book_i-005] Galen presses the point in the synopsis: “He confuses diseases with their differentiae.”(Galen (trans. R.J. Hankinson), 1991) The Methodist taxonomy, Hankinson observes, “confuses mere differentiae with substantial differences,” and the corresponding pathology is “too schematic and primitive.”[galen-10_commentary-book_i-006] Galen adds a parallel charge: “therapies are arrived at either by reason or experience; but Thessalus employs neither.”(Galen (trans. R.J. Hankinson), 1991) Every ancient philosopher of standing — Plato, Aristotle, the Peripatetics, the Stoics — had endorsed Hippocratic natural philosophy; none had endorsed Thessalus.[galen-08_translation-_book_i-004]

Galen’s Positive Method

Starting Points and Axioms

Galen limits the scope of MM to the rational method, which he opposes to Empiricism.(Galen (trans. R.J. Hankinson), 1991) The rational method requires proper definitions and axioms before any demonstration can proceed: “one mustn’t attempt demonstration without being in command of its basics; these are definitions, and the axioms that generate the proofs of the system.”(Galen (trans. R.J. Hankinson), 1991) Inquiry must start from the substance of the matter at issue: “In everything, boy, there is one best starting-point, namely knowledge of what is sought; otherwise everything goes awry, as Plato says somewhere, requiring us to begin from the substance of the thing sought.”[galen-08_translation_-_book_i-006]

Two criteria confirm properly discovered truths: reason and experience. “Logical methods have the power to discover what is sought, while there are two criteria of confirmation of things that have been properly discovered for all men, namely reason and experience.”[galen-08_translation_-book_i-007] This is not mere eclecticism but a principled commitment: Galen holds that logic as a whole is a means of discovery, siding here with the Stoics against Aristotle, while his demand for axiomatic foundations follows the Euclidean model.[galen-10_commentary-book_i-005] All demonstrations in medical science must reduce to primary indemonstrable propositions: “all of them must be reduced to certain primary indemonstrable propositions which are self-justifying. If everyone tried to say something about the therapeutic method in this way, they would be in general agreement with one another, like the arithmeticians, geometers, and calculators.”[galen-08_translation-book_i-008] Among the indemonstrable axioms is the principle of causality: “nothing occurs without a cause.”[galen-08_translation-book_i-011] Hankinson identifies at least five such principles, of which “Nothing occurs causelessly” and “Everything that comes to be does so from something that exists” are foundational.[galen-10_commentary-_book_i-011]

Galen’s ambition is to reconstruct medicine on an axiomatic basis on the model Aristotle described in the Posterior Analytics and Euclid exhibited in the Elements: “Medicine, indeed practical medicine, should be put on all fours with the theoretical, axiomatized sciences like arithmetic and geometry.”[galen-10_commentary_-book_i-010] The first thing any science requires is a proper enumeration of the kinds it ranges over, guided by the real metaphysical structure of the world, not by convenience or stipulation. The scientist must “cut at the joints.”[galen-10_commentary-_book_i-012]

Definitions of Health, Disease, and Activity

From common usage Galen derives his foundational definitions: “whenever there is no impediment in any of the activities of all their bodily parts, people say that they are healthy… but whenever they become aware that some one of their natural functions is beginning to perform either badly or not at all, they consider themselves to be sick.”[galen-08_translation_-book_i-009] The business of the therapeutic method follows directly: “to bring about health in bodies that are diseased; that is, to restore the natural activities of the parts wherever they happen to be impaired.”[galen-08_translation-_book_i-010] The synopsis encapsulates it: “everyone agrees in calling an impairment of the natural faculties ‘sickness’; thus therapy consists in restoring the natural activities.”(Galen (trans. R.J. Hankinson), 1991)

Galen formally defines disease (nosema) as a disposition (diathesis) of the body such as to impede some primary function.[galen-11_commentary_-book_ii-005] Health and illness are contraries and must belong to the same genus; if health is natural activity, illness is unnatural activity.[galen-08_translation-book_i-012] The number of diseases depends on the number of dispositions.(Galen (trans. R.J. Hankinson), 1991) The only thing that needs curing is the disposition of the bodies, since natural activity follows necessarily from a naturally ordered disposition.[galen-08_translation-book_i-014] Galen distinguishes four genera relevant to therapeutic method: activities of the parts, bodily dispositions that cause those activities, the causes that bring about the dispositions, and incidental states (symptoms) that neither promote nor impede activities.[galen-08_translation-book_i-013] A disposition that does not impair any activity is not a disease: “whatever is unnatural and yet has no damaging effect on the activity, is not an illness, but merely a symptom of the disease.”[galen-08_translation-_book_i-015]

The doctor must attend to dispositions, not to names: “the doctor must attend to the dispositions, whatever names he uses; but it is necessary to assign some names for the sake of exposition.”(Galen (trans. R.J. Hankinson), 1991) Diseases are named after parts affected, symptoms, causes, or resemblances.(Galen (trans. R.J. Hankinson), 1991) Terminological precision matters for consistency, not for discovery: “Terminology is unimportant; what matters is discovering the real definition of the referent, on the basis of composition of elements.”(Galen (trans. R.J. Hankinson), 1991) Galen insists that the differentiae are actually in the things themselves, and names must be used consistently to avoid fallacies of equivocation.[galen-10_commentary_-_book_i-014]

Analytic Enumeration of Disease Kinds

A proper enumeration of kinds is not merely disjunctive.(Galen (trans. R.J. Hankinson), 1991) The scientist must use prior knowledge of common conceptions to fix the reference of terms, then work inward to uncover the essences (ousiai) that underlie them: “common conceptions fix the reference of terms in the language; but it is the job of scientific investigation to uncover the ousiai, the essences, that underlie them.”[galen-10_commentary_-_book_i-013] Diseases manifest formal unity: things called by the same name share a real species identity, and “there are numerous tokens of each type.”(Galen (trans. R.J. Hankinson), 1991) Logical ignorance promotes ignorance of genus and species.(Galen (trans. R.J. Hankinson), 1991) The principle of causality is basic to this entire project.(Galen (trans. R.J. Hankinson), 1991)

Book II pursues disease classification systematically. Disease must be one of the four categories of preternatural items (body, environment, affection, symptom) or some combination, yielding fifteen possible combinations.[galen-11_commentary_-book_ii-001] Galen rules out the aggregate of all four because that would leave no room for causes of or symptoms of diseases.[galen-11_commentary-book_ii-002] The number of diseases must correspond to the number of healthy dispositions, with each healthy state having corresponding deviations of excess and defect.[galen-11_commentary-book_ii-015] He distinguishes homoeomerous diseases (qualitative alterations, duskrasiai) from organic diseases (structural alterations of complete organs), and applies the Hippocratic allopathic principle that opposites cure opposites.[galen-11_commentary-book_ii-019][galen-11_commentary-book_ii-018] An indication (endeixis) is “the reflection of a consequence, a method of inferring to the essential nature of things from phenomena”: the disease’s nature dictates its remedy by strict logical inference.[galen-11_commentary-_book_ii-020]

Proper treatment requires that the doctor identify the harmful underlying dispositions: “the important point is that discovery of the harmful dispositions is essential.”(Galen (trans. R.J. Hankinson), 1991) Therapeutic injunctions cannot be vacuously general but must be tied to proper categories.(Galen (trans. R.J. Hankinson), 1991) Knowing when to use indication requires distinguishing it sharply from the Empiricist approach: the importance of indication to non-Empiricist practice lies precisely in the fact that the empirical and rational routes, while they often deliver the same remedy, differ in whether the physician understands why the remedy works.(Galen (trans. R.J. Hankinson), 1991)

Galen also emphasizes that proper science must be founded on demonstration from first principles that are either self-evident to the intellect or apparent to the senses, and that medical science can and should follow this model as strictly as geometry.[galen-10_commentary_-book_i-005] Genuine scientific advance can be made only by people who are morally upright; the best doctor must also be a philosopher.[galen-10_commentary-book_i-001] A grounding in theoretical studies is an absolute prerequisite of successful medical practice, not a luxury.[galen-10_commentary-_book_i-002]

Translation History

The full fourteen books of the Methodus Medendi are preserved in the Kühn edition of Galen’s opera (1821–33), which remains the standard Greek text despite well-known editorial problems. The text was not translated into English in any substantial portion until the nineteenth and twentieth centuries, and even then piecemeal. R. J. Hankinson’s 1991 Clarendon Press volume, which covers Books I and II with facing Greek text, full apparatus, and a substantial introduction and commentary, remains the only English translation of those foundational books. Hankinson contextualizes the text within ancient philosophy and medicine, bringing analytic philosophical tools to bear on Galen’s logic of indication, his genre and species classification, and his theory of demonstration. The quality check note in the evidence directory observes that the OCR of the full document has some space-insertion drift; the chapter-level evidence files are judged clean.

Books I–II were identified by scholars as the methodological introduction, forming a distinct unit. Ilberg’s dating places Books I–VI between Galen’s final return to Rome after 169 CE and the death of Marcus Aurelius in 180 CE, with “all the evidence consistent with a date of composition for books I–VI between 172 and 175.”(Galen (trans. R.J. Hankinson), 1991) A complete translation of all fourteen books appeared later in the Loeb Classical Library series (Johnston and Horsley, 2011), but Hankinson’s two-volume Clarendon edition remains the scholarly standard for Books I–II.

Method of Medicine