Page:O. F. Owen's Organon of Aristotle Vol. 1 (1853).djvu/171

 hence it is the province of experience to deliver the principles of every thing, for instance, I say that astrological experience gives the principles of astrological science, for from phenomena being sufficiently assumed, astrological demonstrations have thus been invented, so also is it in every other art and science. Wherefore if things are assumed which exist in individuals, it is now our duty readily to exhibit demonstrations, for if as regards history nothing is omitted of what is truly present with things, we shall be able about every thing of which there is demonstration to discover and demonstrate this, and to make that clear which is naturally incapable of demonstration.

Universally then we have nearly shown how propositions ought to be selected, but we have discussed this accurately in the treatise on Dialectic.

Chapter 31
THAT the division through genera is but a certain small portion of the method specified, it is easy to perceive, for division is, as it were, a weak syllogism, since it begs what it ought to demonstrate,