DISEASES OF THE UEINARY ORGANS. 131 



Ash aud pUosplioyic acid in Iran and some comnwn fariti. seeds. 



Wheat bran, it will be observed, contains three times as much 

 phosphoric acid as is found in any of the other grains, and four 

 times as much as oats, beans, peas, or rj^e ; so that if fed in excess it 

 will readily overcharge the urine with phosphates. 



There is another point to be considered, however, in estimating 

 this danger. Wlieat bran contains a far greater quantity of albu- 

 minoids and other nitrogen-containing constituents than the common 

 gi-ains (these being made up mainly of starch, which contains no 

 nitrogen) ; and, all nitrogen-bearing products contained in the blood 

 and tissues being expelled from the body mainly through the kidneys 

 in the form of urea and (in cattle) hippuric acid, it follows that the 

 excess of urea formed when such feed is consumed must load the 

 urine with solids and bring it constantly nearer to the point of satu- 

 ration, when such solids (or the least soluble of them) must be 

 deposited. 



The following table will show the relative amounts of the nitrogen- 

 bearing products in wheat bran and some of our common grains: 



Nitrogenous matter in ulieat bran and some common farm grains. 



Kind of grain. 



Wheat bran . 

 Wheat, grain 

 Barley, grain 

 Oats, grain . . 

 Rye, grain . . , 

 Indian com. . 



Albumi- 

 noids (nj. 

 troge- 

 nous). 



Per cent. 

 16.1 

 12.5 

 12.4 

 11.8 

 10.6 

 10.1 



Woody fiber 

 (nitroge- 

 nous.) 



Per cent. 



1.8 



2.7 



1.7 

 1.7 



Total nitrog- 

 enous-bear- 

 ing constit- 

 uents. 



Per cent. 



24.1 

 14.3 

 15.1 

 21.3 

 12.3 

 11.8 



It will be observed that, with the exception of oats, none of the 

 grains contain more than two-thirds of the nitrogenous material 



