AND INSENSIBLE PERSPIRATION. 311 



dinner, observing neither to take or part with 

 any thing during the interim, besides what was 

 lost by insensible perspiration ; the difference 

 in the weights, in this case, was the loss by 

 perspiration. The same procedure was adopted 

 in the afternoon and in the night. 



I continued this train of experiments for three 

 weeks in November, the same year. I then 

 took the aggregate of the morning observations, 

 next that of the afternoon observations, and 

 lastly that of the night observations, and divided 

 each of those three aggregates by the number 

 of hours in the several periods, in order to find 

 the hourly perspiration in each period, appre- 

 hending there might be some differences owing 

 to the time of day, or being awake or in sleep. 



The mean hourly losses, by perspiration, were 

 as under : 



Oz, ttvohrd. 



Morning 1.8 



Afternoon 1.67 



Night 1.5 



During twelve days of this period, I kept an 

 account of urine, corresponding in time with 

 that of perspiration. The ratio was, urine : 

 perspiration :: 46 : 33, or 7 to 5 nearly; which 

 is somewhat greater disproportion than that 



