1889.] 



The Chemistry of the Urine of the Horse. 



339 



mixed chlorides excreted remained about the same, viz., 40 grams 

 daily both at rest and work, but that during rest more potash and 

 less soda was found than during work. This does not agree with the 

 above experiments on the horse. 



I have compiled, from the mean result obtained, the following 

 table of analyses of urine of healthy horses at work and rest. 



I observe that my inorganic solids of rest are in excess of the ash 

 found, and moreover, that the amount of organic substances found in 

 the urine of rest is much smaller than that obtained by evaporation 

 and weighing. In both these matters the urine of work gives better 

 results. 



It is obvious, however, that I have only dealt with the most com- 

 mon and important substances found in urine ; there are many organic 

 substances which I have not looked for, or estimated, or have only 

 estimated on so few occasions as not to entitle them to a place in the 

 table. 



I do not for one moment intend it to be supposed that the table 

 represents wbat all horses at work or rest excrete, for I have pre- 

 viously stated that the horse's urine is a fluid of very varying composi- 

 tion ; all the table represents is the mean of a large number of 

 carefully made observations, which must be accepted as an approxi- 

 mation to the truth rather than as absolutely true. 



Table showing the Mean Composition of the twenty-fours' Urine of 

 Horses at Rest and Work. 





Eest. 



Work. 





c.c. 



c.c. 





4935 



4474 





1036 



1036 





grains. 



grams. 





230 -0713 



232 -157 





146 -1649 



152-190 





83 -9064 



79 -967 





98 •£ 



110 





13-1185 





2-516 



5 -3000 





6-530 









15 -5870 





1 -3000 



1 -8970 





10-6468 



15 -2890 





7 -3166 



7 -6902 





31-7119 



21 -9806 





3 -4367 



1 -9027 





2-9750 



2 6300 





36-5900 



27-0600 





2 -5000 



1 -8400 



