Galen, >On Demonstration

Galen’s On Demonstration (written c. 160 C.E.) was a tour de force of scientific methodology, loosely based on Aristotle’s (and Theophrastus’) Posterior Analytics and suited to the needs of a philosophically minded doctor. In its fifteen volumes, Galen outlined the theory of demonstration and the method of discovering premisses in natural-philosophical arguments, and rehearsed exemplary discussions to show how one should proceed when dealing with scientific problems. His polemics on issues ...