§. 34. He proceeded from hence to the consideration of all the Species of Animals and found that every Individual of them was One. Next he consider'd them with regard to their different Species, viz. as Roes, Horses, Asses and all sorts of Birds according to their kinds, and he perceiv'd that all the Individuals of every Species were exactly like one another, in the shape of their Parts, both within and without, that their Apprehensions, Motions, and Inclinations were alike, and that those little differences which where visible amongst them, were inconsiderable in respect of those many things in which they agreed. From whence he concluded, that the Spirit which actuated any Species was one and the same; only distributed among so many Hearts, as there were Individuals in that Species, so that if it were possible for all that Spirit, which is so divided among so many Hearts, to be Collected into one Receptacle, it would be all the same thing, just as if any one Liquor should be pour'd out into several Dishes and afterwards put all together again in one Vessel; this Liquor would still be the same, as well when it was divided, as when it was altogether, only in respect of that division it may be said in some sort to be Multiplied. By this way of Contemplation he perceiv'd that a whole Species was One and the same thing, and that the Multiplicity of Individuals in the same Species is like the Multiplicity of Parts in the same Person, which indeed are not many [i.e. are only One.]
§ 35. Then he represented in his Mind, all the Several kinds of Animals, and perceiv'd that Sensation, and Nutrition, and the Power of moving freely where they pleas'd, was common to them all; which Actions he was assur'd before, were all very proper to the Animal Spirit, and that those lesser things in which they differ'd (notwithstanding their agreement in these greater,) were not so proper to that Spirit. From this consideration he concluded, that it was only One and the same Animal Spirit, which Actuated all living Creatures whatsoever, tho' there was in it a little difference, which each Species claim'd as peculiar to it self. For instance, suppose the same Water be pour'd out into different Vessels, that which is in this Vessel may possibly be something warmer than that which is in another, tho' 'tis the same Water still, and so every degree of Heat and Cold in this Water in the Several Vessels, will represent the Specifick difference which there is in Animals: And as that Water is all one and the same, so is that Animal Spirit One, tho' in some respect there is a sort of Multiplicity. And so under this Notion he look'd upon the whole Species of living Creatures, to be all One.
§ 36. Afterwards Contemplating the different Species of Plants, as he had done before of Animals, he perceiv'd that the Individuals of every Species were alike, both in their Boughs, Leaves, Flowers, Fruits, and manner of Growing. And comparing them with Animals, he found that there must needs be some one thing which they did all of them partake of, which was the same to them that the Animal Spirit was to the living Creature, and that in respect of That they were all One. Whereupon, taking a view of all the several kinds of Plants, he concluded that they were all One and the same, by reason of that Agreement which he found in their Actions, viz. their Nourishment and Growing.
§ 37. Then he Comprehended in one single Conception, the whole kinds of Animals and Plants together, and found that they were both alike in their Nutrition and Growing, only the Animals excell'd the Plants in Sensation and Apprehension; and yet he had sometimes observ'd something like it in Plants, viz. That some Flowers do turn themselves towards the Sun, and that the Plants extend their Roots, that way the Nourishment comes, and some other such like things, from whence it appear'd to him that Plants and Animals, were One and the same, in respect of that One thing which was Common to them both; which was indeed more perfect in the One, and more obstructed and restrained in the other; like Water that is partly running and partly frozen. So that he concluded that Plants and Animals were all One.
§ 38. He next consider'd those Bodies, which have neither Sense, Nutrition nor Growth, such as Stones, Earth, Air, and Flame, which he perceiv'd had all of them Three Dimensions, viz. Length, Breadth, and Thickness, and that their differences consisted only in this, that some of them were Colour'd, others not, some were Warm, others Cold, and the like. He observ'd that those Bodies which were Warm, grew Cold, and on the contrary, that those which were Cold grew Warm, He saw that Water was rarified into Vapours, and Vapours again Condens'd into Water; and that such things as were Burn't, were turn'd into Coals, Allies, Flame and Smoak, and if in its Ascent it were intercepted by an Arch of Stone or the like, it thickned there and was like other Gross, Earthly Substances. From whence it appear'd to him that, all things were in Reality, One, tho' multiplied and diversified in some certain respects, as the Plants and Animals were.
§ 39. Then considering with himself, what that common thing must be, in which the Sameness of the Animals and Plants did consist he saw that it must be some Body, like those Bodies, which had a Threefold Dimension, viz, Length, Breadth, and Thickness; and that whether it were Hot or Cold, it was like One of those other Bodies which have neither Sense nor Nutrition, and differ'd from them only in those Operations which arise from the Organical parts of Plants and Animals. And that, in, all likelihood, those Operations were not Essential, but deriv'd from something else. So that if those Operations were to be communicated to those other Bodies, they would be like this. Considering it therefore abstractedly, with regard to its Essence only, as stript of those Operations, which at first sight seem'd to flow from it, he perceiv'd that it was a Body, of the same kind, with those other Bodies; upon which Contemplation, it appear'd to him that all Bodies, as well those that had Life, as those that had not, as well those that mov'd, as those that rested in their Natural places were One; Only there were some Actions in some of them, which proceeded from their Organical Parts; concerning which Actions he could not yet determine whether they were Essential, or deriv'd from something without. Thus he continu'd, considering nothing but the Nature of Bodies, and by this means he perceiv'd, that whereas at first sight, Things had appear'd to him innumerable and not to be comprehended; Now, he discovered the whole Mass and Bulk of Creatures were in Reality only One.
§ 40. He continu'd in this Opinion a considerable time. Then he consider'd all sorts of Bodies, both Animate and Inanimate, which one while seem'd to him to be One; and another, a great many. And he found that all of them had a Tendency either upward, as Smoak, Flame, and Air, when detain'd under Water; or else downward, as Water, pieces of Earth, or Parts of Animals and Plants; and that none of these. Bodies were free from one or other of these Tendencies, or would ever lye still, unless hinder'd by some other Body, and interrupted in their course; as when, for instance, a Stone in its fall is stopp'd by the solidity and hardness of the Earth, when 'tis plain it would otherwise continue still descending; so Smoak still continues going upwards, and if it should be intercepted by a solid Arch, it would divide both to the right and left, and so soon as it was freed from the Arch, would still continue ascending; and pass through the Air, which is not solid enough to restrain it. So when a Leathern Bottle is fill'd with Air and stopp'd up close, if you hold it under Water; it will still strive to get up, till it returns to its place of Air; and then it rests, and its reluctancy and propensity to ascend, ceases.
§ 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.
§ 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.
§ 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.