160 THE SECRETIONS: 



stituents = 1 : 58*5, during an animal diet it = 1 : 59' 7 ; 

 i.e. there is a relative diminution. The proportion of uric acid 

 to urea during a mixed diet = 1 : 27'0, during an animal diet 

 it = 1 : 32-7 ; consequently the uric acid is not by any means 

 increased in the same proportion as the urea ; and, indeed, it 

 can hardly be regarded as produced from the protein -compounds 

 in the same manner as the urea probably is. 



The mean amount of free lactic acid excreted daily (as de- 

 duced from four analyses) was 2' 167 grammes. 



The earthy phosphates were determined daily from the 27th 

 till the 31st of July, when the experiments were discontinued. 



The following are the results obtained : 



In 1000 parts In 100 parts Daily amount, 



of urine, in grammes. of solid residue. in grammes. 



3-09 3-913 3-374 



3-72 4-102 3-642 



2-99 4-134 3-632 



2-70 4-046 3-635 



3-13 3-994 3-530 



Consequently, during a purely animal diet, 3-562 grammes of 

 earthy phosphates are, on an average, discharged daily by the 

 urine ; while, during a mixed diet, the average quantity is only 

 1-13 grammes. If we estimate the amount of earthy phos- 

 phates in the albumen at 2g, the whole quantity consumed daily 

 with 189' 7 grammes of albumen, amounts to 3- 794 grammes; 

 consequently, much the greater part (namely, 3*562 grammes) 

 is carried off" by the urine, while the remaining '232 of a 

 gramme is removed with the excrements, perspiration, &c. 



During a mixed diet, a much larger amount of earthy phos- 

 phates was consumed without there being a corresponding in- 

 crease in the urine, the greater part being removed by the 

 intestinal canal. Generally speaking, the amount of excreted 

 earthy phosphates exceeds the amount consumed, the excess, 

 doubtless, arising from the oxidation of the phosphorus con- 

 tained in the protein-compounds during the metamorphosis of 

 the tissues. This view is confirmed by the preceding observa- 

 tions ; for, during the egg-diet, the phosphorized fat contained 

 in the oil of the yelk is conveyed into the fluids of the body, 

 and, by the oxidation of its phosphorus, in addition to the 

 phosphorus of the protein-compounds, the phosphoric acid of 



