16 THE REASON WHY : 



Know, Nature's children, all divide h*r care, 



The fur that warms a monarch, warmed a bear." P:>PE. 



behind moves so languidly through the capillaries, that the change 

 from bright red to deep black red has time to be established before 

 it completes its circuit and reaches the veins. 



36. Wliy is fat necessary to the system ? 



Its principal uses are mechanical. It surrounds the organs like 

 an elastic cushion, so as to protect the more delicate parts from 

 sudden and injurious shocks. The soles of the feet, for example, 

 upon which the whole weight of the body rests, and which in loco- 

 motion are subject to frequent concussion and pressure, are pro- 

 tected by a cushion of fat, which breaks the shooks which would 

 otherwise take place between the foot and the ground, in the same 

 manner as do the buffer-cushions which are placed between the 

 carriages of a railway train. 



37 There is another physical quality in fat which renders it of considerable 

 utility in the animai economy. It is nearly a non-conductor of heat, and as it is 

 pcnerally collected in a superficial stratum investing the organs, it prevents the 

 undue escape of heat, and keeps the body warm ; it thus performs the part of a 

 blanket or clothing, and it is found accordingly that fat persons are less chilly than 

 thin persons. 



38. Why does hair form so appropriate a covering for the head t 



The hairs by their number and the manner in which they 

 are disposed, are well adapted to deaden any strokes which may fall 

 on the head, and to prevent strong pressure from wounding the 

 skin. Being bad conductors of heat, they form a sort of felt, whose 

 meshes intercept the air, and by that means preserve a uniform 

 temperature in the head, to a certain degree, independent of that, of 

 the aii and of surrounding bodies ; besides, being impregnated with 

 an oilv matter, the hair imbibes but a small quantity of water, and 

 vcr\ MOOII dries. 



89. Why is the human body soft and round in youth, <ind hcvrd t 

 unequal, and angular in advanced life ? 



Because the softness and roundness of form of the human body is 



