56 



tf poii the backs of the ends of the lingers and toes, 

 which they support to make a due resistance in the 

 apprehension of objects, having the nervous papillary 

 bodies, that serve the organ of touch, placed under 

 their lower surface. They arise with a square root, 

 intermixed \\ilh the periosteum, a little before the last 

 joints, from betwixt the outer and inner stratum of 

 the skin, and passing on soft, go out by a lunar cleft 

 in- the external plate of the skin, where the cuticle 

 returns back, and enters into a close adhesion with 

 the root of the nail, together with which it is extended 

 as an outer covering. 



35, We proceed^ the middle cavity of the body. 

 Herein the principal part is the Heart, consisting of a 

 vStrong tei.don, extended obliquely from the basis or 

 broader part, to the cone, into which the fleshy fibres 

 are inserted, in an elegant scries, with a spiral bending 

 one half opposite to, and crossing the, other : by which 

 means the grand muscle is admirably fitted both to re. 

 fdve and to propel the blood. It has two great 

 cavithsj usually termed the ventricles of the heart 

 They are divided from each other by an intermediate 

 part, called the septum, constituted by the same fibres, 

 which is convex on the side next the right ventricle, 

 and concavn on the other. 'JPhe vena cava is inserted 

 in the right ventricle, and two inches from its inser. 

 tion, divides into the upper and lower. The, former 

 brings the blood into it from the upper ; the latter, 

 from the lower parts of the body. The pulmonary 

 artery carries the blood from that ventricle into the 

 lungs, which the pulmonary vein brings from thenc& 

 into the left ventricle. At the upper side of these 

 veins, there is added to each ventricle, a kind of purse 

 called the auricle, which is a hollow muscle of the 

 same structure with the heart, in order to stay the 

 blood, that it pour not too violently into the ventricle. 

 Before the orifices of the veins of the heart, there are 

 triangular valves, and semilunar in the orifices of 

 the arteries, to hinder the reflux of the blood from 



