PERSPIRATION AND SWEAT. 505 



sides phosphate and carbonate of lime, and a trace of peroxide of 

 iron, which are insoluble in water. * 



Anselmino found that the sweat, during a fit of the gout, con- 

 tained more ammonia and saline matter than when in a state of 

 health. He found, also, that a critical sweat, during a rheuma- 

 tic fever, contained a good deal of albumen. 



If any conclusion can be deduced from the smell, sweat in 

 different parts of the body is not identical. That of the feet 

 has quite a different smell from that of the arm-pits ; while that 

 of the groin in fat persons has often the smell of butyric acid. 



Little is known respecting the perspiration and sweat of the 

 inferior animals. It is well known that the genera of quadrupeds 

 belonging to the dog and the cat tribe do not perspire at all. In 

 ruminating animals and pachydermata, on the contrary, perspira- 

 tion is abundant. Anselmino has examined the crusts of dried 

 sweat, which may be separated from the skin of a horse by the 

 brush. Being digested in hot water a pulverulent matter re- 

 mained undissolved. The solution was evaporated to dryness, 

 and the residue digested in alcohol of O833. The solution ob- 

 tained gave, when evaporated, a brown extract filled with saline 

 crystals. Absolute alcohol dissolved from it an acid extractive 

 matter holding in solution a combustible salt of potash. Hence 

 it seems to be of the same nature with the matter obtained from 

 human sweat by a similar process. The absolute alcohol left 

 common salt mixed with an extractive matter, having a strong 

 odour of a horse. 



The portion of the residue left undissolved by the alcohol of 

 0-833 dissolved in water, to which it communicated a brown co- 

 lour. Besides common salt and sulphate of soda, it contained 

 an animal matter, precipitated by infusion of nut-galls, and by 

 chlorine ; by the last only, after an interval of several days. It 

 was neither precipitated by nitric acid, ammonia, nor corrosive 

 sublimate. 



The portion of residue of sweat insoluble in alcohol and 

 water, Anselmino considered as coagulated albumen. Four- 

 croy had announced the presence of urea in the sweat of the 

 horse, but Anselmino could discover no trace of it. The ashes 

 from the dried sweat of the horse consist of sulphates of potash 

 and soda, common salt, and chloride of potassium ; it contains 



* Berzelius, Trait6 de Chimie, vii. 326. 



