: CHAP, xviu.] SECRETIONS AND EXCRETIONS IN PARTICULAR, 269 



substances, whose proportion incessantly varies. We find in it 

 i a quantity of mineral salts, first of all chlorure of sodium, then 

 j chlorure of potassium, chlorohydrate of ammonia, 'sulphates of 



soda and potash, phosphates of lime, of soda, of potash, of mag- 

 i nesia, ammoniaco-magnesian phosphate, carbonates of lime, of 

 i potash. The organic salts and the quaternary products resulting 

 I from the disassimilation are lactates of soda, of potash, of lime, 



urates of lime, of magnesia, of soda, of potash, of ammonia, a 



FIG. 38. 



Schematic representation of a Malpighi glomerule of the bladder : a, sanguineous vessel 

 entering ; b, sanguineous vessel leaving ; c, clusters of the capillary vessels in the 

 . interior of the glomerule ; d, lower part of the capsule drawn without its epithelium ; 

 f , commencement of the urinary canal ; /, internal epithelium of the mass of the capil- 

 laries ; g, internal epithelium of the capsule. 



little uric acid, and besides, especially in the herbivorous animals, 

 hippuric acid and hippurates. Finally, we must add to this 

 long, though incomplete list, the most important products of 

 excretion, urea, creatine, creatinine, immediate principles of the 

 second class derived direct from the oxydation of the albumin- 

 oidal substances in the concatenation of the tissues. 



The composition of urine varies under the influence of all the 

 causes capable of acting on the nutrition of the animal organism. 



