Sec. 42. In like manner he consider'd either Bodies, both Animate and Inanimate, and found their Essence confined in _Corporeity_ and in some, one thing, or more superadded to it. And thus he attain'd a Notion of the Forms of Bodies, according to their differences. These were the first things he found out, belonging to the Spiritual World; for these Forms are not the objects of Sense, but are apprehended by Intellectual Speculation. Now among other things of this kind which he discover'd, it appear'd to him that the _Animal Spirit_, which is Seal'd in the Heart (as we have mention'd before) must necessarily have some _Quality_ superadded to its _Corporeity,_ which rendred it capable of those wonderful Actions, different Sensations and Ways of apprehending Things, and various sorts of Motions; and that this _Quality_ must be its _Form_, by which it is distinguish'd from other Bodies (which is the same that the Philosophers call the Sensitive Soul) and so in Plants, that which was in them the same that radical Moisture was in Beasts, was something proper to them, which, was their _Form_, which the Philosophers call the Vegetative Soul. And that there was also in inanimate things, (_viz_. all Bodies, besides Plants and Animals, which are in this sublunary World) something peculiar to them, by the Power of which, every one of them perform'd such _Actions_ as were proper to it; namely, various sorts of Motion, and different kinds of sensible Qualities, and that thing was the Form of every one of them, and this is the same which the Philosophers call _Nature_. Sec. 43. And when by this Contemplation it appear'd to him plainly, that the true Essence of that _Animal Spirit_, which he had been so intent, was compounded of Corporeity, and some other Quality superadded to that Corporeity, and that it had its Corporeity in common with other Bodies; but that this other Quality which was superadded, was peculiar to it self: Immediately he slighted and despis'd the Notion of Corporeity, and applied himself wholly to that other superadded Quality (which is the same that we call the _Soul_) the Nature of which he earnestly desired to know. Therefore he fix'd all his Thoughts upon it, and began his Contemplation with considering all Bodies, not as Bodies, but as endu'd with _Forms_, from whence necessarily flow these Properties, by which they are distinguish'd one from another.