96 GENERAL ANALYSIS. 



344. THE WHOLE CIRCUIT by which the four necessi- 

 ties of the organs are satisfied, is composed of only four 

 different kinds of organs, as follows : 



Arteries, 



Arteries, f -? 



Heart, Capillaries, 



Veins. Kl f 



345. THE FLUID CALLED BLOOD, with which this 

 circuit is filled, is not a simple fluid, but must be a 

 mixture of*four classes of material: 1st, The waste 

 substance produced by the action of organs; 2d, the 

 nutritive material adapted to replace the waste ; 3d, the 

 materials for producing heat ; and, 4th, the means of 

 cooling the organs. 



346. THE MOST WONDERFUL ILLUSTRATION OF THE 

 BEAUTIFUL SIMPLICITY OF THE HUMAN STRUCTURE, and 

 the gaining of desirable results by unexpected means, 

 that can be traced in the whole system, is this one sim- 

 ple arrangement, by means of a single fluid to produce 

 complex and apparently unattainable results. 



347. THE BLOOD COURSING THROUGH THE CAPILLA- 

 RIES can gather every decomposing particle of substance 

 and bear it away ; and if in some part of the Blood-cir- 

 cuit modifying organs, and in another part eliminating 

 organs, are located, the substance can either be fitted for 

 some secondary duty, or cast out of the current of the 

 blood, never more to enter it. 



348. THE BLOOD CAN NOURISH THE ORGANS, if prop- 

 er organs for replenishing the Blood are applied to its 

 circuit, so that it can receive nutritious substances and 

 pour them into the capillaries, through the sides of which 

 organs can feed themselves as liberally as .their exigen- 

 cies demand. (See Figs. 90 and 100.) 



349. THE BLOOD CAN KEEP THE ORGANS WARM, if 



844. What is said of ? 845. What is ? 846. What is ? 847. What is said 

 of f 848. How ? 849. H OW _ ? 



