Sec. 41. He then enquir'd whether or no he could find any Body that was at any time destitute of both these Motions, or a Tendency toward them, but he could find none such, among all Bodies which he had about him. The reason of this Enquiry was, because he was very desirous to know the Nature of Body; as such, abstracted from all manner of Qualities, from whence arises Multiplicity or Diversity of Kinds. But when he found this too difficult a Task for him, and he had examin'd those Bodies which had the fewest Qualities, and could find, none of them void of one of these two, _viz._ Heaviness or Lightness; he proceeded to consider the Nature of these two Properties, and to examin whether they did belong to Body _quatenus_ Body, or else to some other Quality superadded to Body. Now it seem'd plain to him, that _Gravity_ and _Levity_, did not belong to Body as such; for if so, then no Body could subsist without them both: whereas on the contrary, we find Heavy Bodies which are void of all Lightness, and also some Light Bodies which are void of all Heaviness, and yet without _doubt_ they both are _Bodies_; in each of which there is something superadded to Corporeity, by which they are distinguish'd one from the other, and that makes the difference between them, otherwise they would be both one and the same thing, in every respect. From whence it appear'd plainly, that the Essence both of an _Heavy_, and _Light Body_ was compos'd of two things; One, which was common to them both, _viz. Corporeity_, the other, by which they are distinguish'd one from the other, _viz. Gravity_ in the one, and _Levity_ in the other, which were superadded to the Essence of Corporeity.