§ 28. And now he Apprehended plainly that every particular Animal, tho' it had a great many Limbs, and variety of Senses and Motions, was nevertheless One in respect of that Spirit, whose Original was from one firm Mansion, viz. the Heart, from whence, its Influence was diffus'd among all the Members. And that all the Members were subservient to it, or inform'd and supported by it, and that this Spirit made use of those Members, in the same manner as a Soldier do's of his Weapons, or an Huntsman or Fisherman of his Tackling, who makes use of different ways and things, according to the difference of the Creatures he intends to catch. Now the Soldiers Weapons are some of 'em defensive and offensive, and the Sportsman's too are some for Land, and some for Water: So the Anatomists Instruments, are some for Fission, others for Fraction, and others for Perforation. And thus tho' the Body was One, yet that governing Spirit made use of it several ways, according to the respective uses of each Member, and the several ends which it propos'd to obtain.
§ 29. Thus he perceiv'd that there was all this while but One Animal Spirit, whose Action when he made use of the Eye, was Sight; when of the Ear, Hearing; when of the Nose, Smelling; when of the Tongue, Tasting; and when of the Skin and Flesh, Feeling. When it employ'd any Limb, then its Operation was Motion; and when it made use of the Liver, Nutrition and Concoction. And that, tho' there were Members fitted to every one of these uses, yet none of them could perform their respective Offices, without having Correspondence with that Spirit, by means of the Nerves; and that if at any time it chanc'd that their passages were either broken off or obstructed, such a Member would be altogether useless. Now these; Nerves derive this Spirit from the Brain, which has it from the Heart (and contains abundance of Spirit, because it is divided into a great many partitions) and by what means soever any limb is depriv'd of his Spirit, it's Action ceases, and 'tis like a cast off Tool, not fit for use. And if this Spirit depart wholly from the Body, or is consum'd or dissolv'd by any means whatsoever, then the whole Body is depriv'd of Motion all at once, and reduced to a State of Death.
§ 30. Thus far had his Observations brought him about the end of the Third Seventh Year of his Age, viz. when he was One and Twenty Years Old. In which time, he had made abundance of pretty Contrivances. He made himself both Cloaths and Shoes of the Skins of such Wild Beasts as he had dissected. His thread was made of Hair, and of the Bark of the Stalks of Althaea, Mallows or any other Plants, which afforded such Strings as were fit for that purpose. He learn'd the making of these threads from the use which he had made of the Rushes before. He made Awls of sharp Thorns, and Splinters of Cane, sharpned with Flints. He learn'd the Art of Building, from the Observations he made upon the Swallows Nests. He Builds himself a Store-house and a Pantry, to lay up the remainder of his Provision in: and made a Door to it of Canes twisted together, to prevent any of the Beasts getting in, during his absence. He took Birds of prey and brought them up for Hawking; and kept tame
Poultry for their Eggs and Chickens. He took the tips of the Buffalo's Horns and fastned them upon the strongest Canes he could get, and Staves of the Tree Alzân and Others; and so, partly by the help of the Fire, and partly of sharp edg'd Stones, he so fitted them that they serv'd him instead of so many Spears. He made him a shield of Hides folded together. All this pains he took to furnish himself with Artificial Weapons, because he found himself destitute of Natural ones.
§ 31. Now when he perceiv'd that his Hand supplied all these defects very well, and that none of all the various kinds of Wild Beasts durst stand against him, but ran away from him, and were too Nimble for him. He began to contrive how to be even with them, and thought there would be no way so proper as to chuse out some of the strongest and swiftest Beasts of the Island, and bring 'em up tame, and feed them with proper Food, till they would let him back them and then he might persue the other kinds of Wild Beasts. There were in that Island both Wild Horses and Asses; he chose of both sorts, such as seem'd fittest for his purpose, and by exercise he made them so gentle and tractable that he was compleat Master of his Wishes. And when, he had made out of the Skins of Beasts, such things as serv'd him competently well, in the Room of Bridles and Saddles, he could very easily then overtake such Beasts, as he could scarce ever have been able to have catch'd any other manner of way. He made all these discoveries whilst he was employed in the Study of Anatomy, and the searching out of the Properties, peculiar to each Part, and the difference between them; and all this about that time I speak of, viz. of the Age of 21 Years.
§ 32. He then proceeded further to examin the Nature of Bodies in this Sublunary World, viz. The different kinds of Animal, Plants, Minerals, and several sorts of Stones, Earth, Water, Exhalations, Ice, Snow, Hail, Smoak, Hoar, Frost, Flame, and Heat. In which he observ'd different Qualities, and different Actions, and that their Motions agreed in some respects, and differ'd in others: and considering these things with great Application, he perceiv'd that their Qualities also agreed in some things, and differ'd in others; and that so far as they agreed, they were One; but when consider'd with Relation to their differences, a great many: so that when he came to consider the Properties of things by which they were distinguish'd one from another,he found that they Multiplied so fast upon him, that 'twas impossible for him, to Comprehend them. Nay, when he consider'd the difference of his own Limbs, which he perceiv'd were all distinct from one another, by some Property and Action peculiar to each, it seem'd to him that there was a Plurality in his Own Essence. And when he look'd upon any one Member it self, he found that it might be divided into a great many parts, from whence he concluded, that there must needs be a Plurality in his own Essence, and not only in his own but in every other also.
§ 33. Then he enter'd upon another sort of Speculation of the second kind, by which he perceiv'd that tho' the parts of his Body were many, yet they were Conjoyned and Compacted together so as to make one Body, and that what difference there was between them consisted only in the difference of their Actions, which diversity proceeded from that Animal Spirit, the Nature of which he had before search'd into, and found out. Now he knew that his Spirit was One in Essence, and was really the Substance of his Being, and that all the rest of the Members serve that Spirit as Instruments, and in this Respect he perceiv'd his own Essence, to be One.