The _First_ is divided into 5. Books. In the _four first_, he treats of _Plants_, and distributes them into three _Classes_; some growing _in the Earth_, as _Trees_; others, growing upon _Plants_, as _Mosse_; and a third sort growing upon _Animals_, as _Hair_, _Horns_, and _Feathers_. He examins and considers the {326} Parts of all these Plants and their Use, the manner, how they are produced, and nourished; and their different Qualities. He discourses also of Bread, Wine, Oyle, and the other Mixtures, that are made of Plants. In the _Fifth Book_, he treats of the _Generation of Animals_, where he delivers many curious matters, explicating in a very easie and familiar way that Argument, which hath always been lookt upon, as one of the obscurest in Natural Philosophy. The _Second_ Treatise consists of 7. Books; wherein the Author considers, what appertains to _Man_. He discourses _first_, of Digestion, of the Circulation of the Bloud, and of the Use of the principal parts of the Humane Body. _Next_, he treats of the Senses, External and Internal; of all the Motions of the Body, both Natural and Voluntary, of the sensitive Appetite, and the Passions; _Thence_ he proceeds to the Temperaments, Habits, Instinct, Sleep, Sickness, &c. _Lastly_, passing to the _Rational Soul_, he endeavours to demonstrate the Immortality thereof, and to explain also the Manner, how it worketh upon the Body, and is united with the Body; where he omits not to reason of all the Powers of the Soul, of Liberty, and of the Operations of the Understanding and Will. In _general_, the Author makes it his study, for the explicating of the most perplext Difficulties, to shew, that Nature works not but by very simple and easie wayes.