98 GENERAL ANALYSIS. 







excreted into it by the action of the branial and nervous 

 organs. 



355. THE INTESTINAL CANAL AND SOME OF ITS AP- 

 PENDAGES HAVE BEEN CONSTRUCTED with reference to the 

 elimination from the Blood of substances excreted into 

 it by the action of the muscles. 



356. THE LUNGS HAVE BEEN CONSTRUCTED with ref- 

 erence to eliminating from the Blood useless substances 

 arising from the production of heat. 



357. THE PERSPIRATORY GLANDS OF THE SKIN 

 HAVE BEEN CONSTRUCTED with reference to removing 

 water from the Blood when it is too warm. (When too 

 cool, the water is removed by the kidneys.) 



358. THE WHOLE SIMPLE PLAN BY WHICH EXCRE- 

 TION, NUTRITION, WARMING, AND COOLING, ARE PRO- 

 DUCED, is to have the single compound fluid, Blood, cir- 

 culate from a Heart outward, through arteries, into and 

 through capillaries, and return through veins a cluster 

 of organs by which it can be modified, purified, supplied 

 with all needed substances, and cooled, being attached 

 to some convenient part of the circuit, so that during 



FIG. 89. 



Fig. 89 is a plan like Fig. 87, except that O represents an attached or- 

 gan either for supplying to, or eliminating from, the Blood received 

 through a branch of a. At each circulation some of the blood will pass 

 through O, and if it should be multiplied the game would be the case 

 with all. 



855. How ? 856. How ? 357. How 858. What is ~ ? Describe 



