ength, Breadth,_ and _Thickness_, in a due Proportion. And these
two Actions are common to Plants and Animals, and do without doubt
spring from that Form which is common to them both, which is what we
call the _Vegetative Soul_. Now part of this Multitude, _viz._ Animals,
tho' they have the first and second Forms in common with the rest, have
still a third Form superadded, from which arise Sensation and Local
Motion, Besides, he perceiv'd that every particular _Species_ of
Animals, had some Property which, distinguish'd it, and made it quite
different from the rest, and he knew that this Difference must arise
from some Form peculiar to that _Species_, which was superadded to the
Notion of that Form which it had in common with the rest of Animals. And
the like he saw happen'd to the several kinds of Plants.

Sec. 45. And it was evident to him, that the Essences of those sensible
Bodies, which are in this sublunary World, had some of them more
Qualities superadded to their _Corporeity_, and others, fewer. Now he
knew that the Understanding of the fewer, must needs be more easie to
him, than the Understanding of those which were more in number. And
therefore, he endeavour'd to get a true Notion of the Form of some one
thing, whose Essence was the most simple and uncompounded. Now he
perceiv'd that the Essence of Animals and Plants consisted of a great
many Properties, because of the great variety of their Operations; for
which reason, he deferr'd the enquiring into their Forms. As for the
Parts of the _Earth_, he saw that some of them were more simple than
others, and therefore resolv'd to begin his Enquiry with the most simple
of all. So he perceiv'd that _Water_, was a thing, whose Essence was not
compounded of many Qualities, which appear'd from the Paucity of those
Actions which arise from its Form. The same he likewise observ'd in the
_Fire_, and _Air_.

Sec. 46. Now he had a Notion before, that all these four might be chang'd
one into another; and therefore there must be some one thing which they
jointly participated of, and that this thing was Corporeity. Now 'twas
necessary, that this one thing which was common them all, should be
altogether free from those _Qualities_, by which these four were
distinguish'd one from the other; and be neither _heavy_ nor _light_;
_hot_ nor _cold; moist_ nor _dry_; because none of these Qualities were
common to all Bodies, and therefore could not appertain to _Body_ as
such. And th