URINE. 157 



From these data it appears that, during his ordinary mixed 

 diet, the urea amounted on an average to 46*23g of the solid 

 residue, and that the average amount of urea excreted in twenty- 

 four hours was 32-498 grammes, or about 500 grains. 



The amount of uric acid was determined on the 2d, 6th, 7th, 

 8th, llth, and 12th days. The following results were obtained : 



Uric acid Uric acid Daily amount 



in 1000 parts in 100 parts of uric acid, 



of urine. of solid residue. in grammes. 



073 1-626 0-967 



124 1-729 1-357 



021 1-638 0-919 



097 1-651 1-031 



131 2-001 1-630 



098 1-615 1-195 



From these numbers it appears that 1000 parts of urine con- 

 tain, on an average, 1*089 of uric acid; and that 100 parts of 

 solid residue contain 1*71 of uric acid; likewise, that the daily 

 amount of excreted uric acid is 1*183 gram., or about 18*3 grains. 

 Hence the daily amount of urea is to that of uric acid as 27 : 1. 



The mean amount of free lactic acid, (or, at least, the sub- 

 stance regarded by Lehmann as lactic acid,) in 1000 parts of 

 urine was 1*525 ; and in 100 parts of solid residue, 2*325. The 

 mean daily amount was 1*534 gram., or 23*6 grains. 



The mean amount of combined lactic acid in 1000 parts of 

 urine was 1*160 ; and in 100 parts of solid residue, 1*703. The 

 mean daily amount was 1*173 gram., or 18 grains. 



Having thus determined a standard of comparison, he pro- 

 ceeded to notice the effect of a purely animal diet on the urine. 

 He lived for twelve days on a purely animal diet, and for four 

 of these days entirely on eggs, during which period he consumed 

 128, or 32 a day. From an analysis of the eggs it appeared 

 that he took daily 189*7 grammes of dry albumen, free from 

 ash, and 157*48 grammes of fat; and from Scherer's analyses 

 it appears that this albumen contained 104*335 grammes of 

 carbon, and 30*16 grammes of nitrogen ; while the fat contained 

 124*41 grammes of carbon. Hence the whole amount of carbon 

 was 228*75 grammes, a little within the amount given off in the 

 course of twenty-four hours, according to Liebig. The obser- 

 vations were conducted for twelve successive days in July, and 

 yielded the following results : 



