URINE. 349 



In both the above analyses he searched in vain for hippuric 

 or benzoic acid in three ounces of the fluid. 



In two other analyses he obtained microscopic crystals of 

 hippuric acid on the evaporation of the ethereal solution. He 

 never detected even a trace of uric acid, which, considering the 

 mixed nature of the food of these animals, is extraordinary. 



Boussingault analysed the urine of a pig feeding on potatoes 

 and water slightly impregnated with salt. The urine was 

 alkaline, very limpid, and of an extremely pale yellow colour. 

 Its specific gravity was 1013-6. 



It contained in 1000 parts : 



Water and indeterminate organic matter 979-14 



Urea . . . 4-90 



Bicarbonate of potash . . 10' 74 



Carbonate of magnesia . . .0-87 



Carbonate of lime . . . traces 



Sulphate of potash . . . 1'98 



Phosphate of potash . . .1-02 



Chloride of sodium . . .1-28 



Alkaline lactates . . undetermined 



Hippuric acid 1 . . . absent 

 Silica 0-07 



The urine of the goat has been analysed by Von Bibra. The 

 animals from whom the fluid was obtained were confined in a 

 stable and poorly fed, getting sour hay, &c. The urine was 

 clear, of a peculiar but pungent odour, and alkaline. The spe- 

 cific gravity was generally 1008 or 1009. In two instances it 

 contained in 1000 parts : 



1 Thinking that the absence of hippuric acid might be dependent on the diet, 

 Boussingault mixed green trefoil with the potatoes : the result was, however, still 

 the same. 



