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.

In _particular_ he intersperses several curious remarks. _E.g._ He teaches
how to make _Perspectives_, that magnifie Objects, without Glass; telling
us, that when an Object is look't upon through a small hole, it appears
much greater than it is; and that therefore, if instead of Glasses one did
cast before ones eyes two _Plates_ having little holes in them, it would
furnish us with a new kind of _Perspectives_, more commodious than those of
Glasses, which spoil the Sight by reason of the refraction of the Rayes,
caused thereby. _Again_, He renders the cause of that common, but
surprising, effect of Painters, drawing certain Pourtraictures, which seem
to look directly upon all their Beholders, on what side soever they place
themselves: _Videl._ That in those Pictures, the Nose it a little turned to
one side, and the eyes to the other. Whence it comes, that such pictures
seem to look to the right side, because the Eyes are indeed turned that
way; but they appear also to look to the left, because the point of the
Nose is turned that way, and the Table, whereon the Picture is drawn, being
flat