It is a Part which is form'd of Blood thicken'd by the natural Heat; and that constitutes the Body of a Muscle. _What is Fat?_ It is a soft Body made of the Unctuous and Sulphurous part of the Blood. _What is the _Derma_ or Skin?_ It is a Net compos'd of Fibres, Veins, Arteries, Lymphatick Vessels and Nerves, which covers the whole Body to defend it from the Injuries of the Air, and to serve as a universal Emunctory: It is very thin in the Face, sticking close to the Flesh, and is pierc'd with an infinite number of imperceptible Pores, affording a Passage to insensible Transpiration. _What is the _Epiderma_, or Scarf-Skin?_ It is a small fine Skin, transparent and insensible, having also innumerable Pores for the discharging of Sweat, and other Humours by {10} imperceptible Transpiration: It is extended over the whole inner Skin, to dull its too exquisite Sense, by covering the Extremities of the Nerves which are there terminated. It also renders the same Skin even and smooth, and so contributes very much to Beauty. _What is the Hair?_ The Hairs are certain hollow Filaments planted in the Glandules of the Skin, from whence their Nourishment is deriv'd. They constitute the Ornament of some Parts, cover those which Modesty requires to be conceal'd, and defend others from the injury of the Weather. _What is a Nail?_ The Nails are a Continuity of the Skin harden'd at the end of the Fingers, to strengthen and render them fit for Work. * * * * * CHAP. IV. _Of the general Division of a Humane Body._ _How is the Humane Body divided before it is dissected, in order to Anatomical Demonstration?_ Some Anatomists distinguish it into _Similar_ and _Dissimilar_ Parts, appropriating the former Denomination to all the simple Parts of the Body taken separately, as a Bone, a Vein, a Nerve, _&c._ but they attribute the Name of Dissimilar to all those Members that are compos'd of many Similar or Simple Parts together; such are the Arms, {11} Legs, Eyes, _&c._ wherein are contain'd all at once, Bones, Veins, Nerves, and other parts. Others divide it into _containing_ and _contained_ Parts, the former enclosing the others, as the Skull includes the Brain, and the Breast the Lungs; whereas the contained Parts are shut up within others; as the Entrails within the Belly, the Brain within the Skull, _&c._ Others again divide the whole Body into _Spermatick_ and _Sanguineous_ Parts; the former being those which are made at the time of Formation; and the latter all those that are grown afterward by the Nourishment of the Blood. _Are there not also other Methods of dividing the Humane Body?_