The arte of logick Plainely taught in the English tongue, according to the best approued authors. Very necessary for all students in any profession, how to defend any argument against all subtill sophisters, and cauelling schismatikes, and how to confute their false syllogismes, and captious arguments. By M. Blundevile.

What is to be obserued in a perfect Demonstration?

That the Predicate of the Conclusion, which is also Predi∣cate in the Maior, be first, properly, alwayes, and that really and accidentally, incident to the subiect of the Maior, and to euery thing contained vnder the same, which subiect must bee some generall kind, and the very meane or proofe of your con∣clusion: As for example, if you would prooue a Cocke to be a feathered fowle, it were not a sufficient demonstration to say, that euery flying beast is a feathered fowle; for some beastes flie, that haue no feathers; as Backs, that flie in the night sea∣son. But if you say, that euery bird is a feathered fowle, & euery Cocke is a bird: Ergo, euery Cocke is a feathered fowle: you shall make a perfect demonstration, because the Subiect, and Predicate of the Maior, haue such conditions as are before re∣quired; for this Maior sheweth the thing to be, and also wher∣fore it is, which is done so often as the Predicate is the true de∣finition

of the Subiect: as when I say, Euery man is a sensible body endued with reason, or else some chiefe part of the defi∣nition, as when I say, Euery man is endued with reason, as hath been said before: for euery good demonstration is either made of a true definition, or taken frō the general kind, special kind, or else from the speciall difference, or propertie, yea, and some∣time they may bee taken out of the whole and of the parts, of the proper causes and effects, of perpetual adiacents, otherwise called common accidents, of proper acts, of contrarieties, and of diuine authoritie, whereof you haue had examples before in the treatise of places, and seates of arguments.