§ 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.