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THe study of a Philosopher seemeth according to Plato to be conversant chiefly in three things, in the Contemplation and knowledge of things, in the Practice of Vertue, and in Disputation. The Science of things that are, is called Theoretick, of
those which pertain to Action, Practick; the disputative part, Di∣alectick.
Dialectick is divided into Division, Definition, Induction and Syl∣logisme; Syllogisme into the Apodeictick, which concerneth necessa∣ry ratiocination; and Rhetoricall, which concerneth Enthymeme, called an imperfect ratiocination; and lastly into Sophismes. This the Philosopher must look upon, not as the chiefest but a necessa∣ry part.
Of Practick Philosophy, one part is conversant about Manners, another orders Families, the last takes care of a Commonwealth. The first called Ethick, the second, Oeconomick, the third, Politick.
Of Theoretick Philosophy, one part enquires into things immu∣table and divine, and the first causes of things; this is called Theologie; another the motion of the stars, the revolution and resti∣tution of Celestial Bodies, and the constitution of the world. This is called Physick. That whereby we enquire Geometrically, and those other disciplines which are called 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉, is termed Mathematick.
Philosophy being thus divided, wee must first according to Plato speak of the Dialectick part, and in that, first of the Iudi∣ciarie.