Academia scientiarum, or, The academy of sciences being a short and easie introduction to the knowledge of the liberal arts and sciences, with the names of those famous authors that have written on every particular science : in English and Latine / by D. Abercromby ...

Sect. XVII. Logick.

LOgick is the Art of Disputing wel•• The three operations of the Min•• make up its whole object, which are Ap∣prehension, Judgement or Affirmation and Illation. It teacheth, that the truth of any of those three operations consist•• in their confirmity to their objects: S•• this compounded Apprehension, Go•• Almighty, is true, because I apprehen•• God to be, what he really is, that i•• Almighty; you may easily apply this t•• the other two Operations.

Its two chief Principles are these Dictum de omni, and Dictum de nul∣lo: The first signifieth, that whatever 〈◊〉〈◊〉 generally affirmed of any thing, m•…•… likewise be affirm'd of whatever is con∣tain'd under that thing, as if I s•…•… Every Animal is a living Creature, th•…•… it follows, that a Bird is a living Cre••∣tur••▪

The second signifieth, that what ever is generally denied of any thing is denied likewise of whatever is con∣tain'd under that thing; as if I say No Animal is a Stone, then I may, an cught likewise to say, No Bird is Stone, No Man is a Stone, &c.

Logick teacheth the Art of making Syllogism, which consisteth of three Pro∣positions, whereof the first two being gran∣ted, the Conclusion must necessarily b•• granted, because it was already impli∣citely admitted by him, who admitted of the Premises: As 'tis evident in this Syllogism, Every Man is a living Crea∣ture, Peter is a Man, ergo, Peter is a living Creature.

Logick is natural to all Mankind, be∣cause 'tis nothing else but the use of our Reasoning Faculty. Artificial Logick is made up of some Rules and Precepts that help our Reasoning Faculty.

Authors.

Aristotle, Arriaga, Ruvius, Guil∣minot, &c.