URINE. 463 



cific gravity of the urine of a middle aged man in perfect health 

 to be 1O1385. It varied in the course of a fortnight from 1-0093 

 to 1*0192. But it was observed occasionally as high as 1-0266. 

 Lecanu found the mean specific gravity of the urine of young men 

 greater than that of old persons.* According to Becquerel the 

 mean specific gravity of urine is as follows : 



In males, . . 1*0180 

 In females, w'j f - 1-01512 



Mean, k&o6 1-01656 



I found in a healthy middle aged individual the mean quan- 

 tity of urine voided in twenty-four hours, amount to 3^ Ibs avoir- 

 dupois. But it varied a great deal, being sometimes as low as 

 2-133 Ibs., and sometimes as high as 4*857 Ibs. 



Lecanu has given us a considerable series of facts on the quan- 

 tity of urine voided by different individuals in twenty- four hours: 

 In thirteen individuals it varied from 1*16 Ibs. to 5-007 Ibs. 

 In five young men from the age of 20 to that of 40 years, the 

 quantity of urine voided in 24 hours, varied from 1 -64 Ibs. to 

 5-007 Ibs. 



In young men the quantity of urine voided is greater than in 

 old men or in infants. 



When we take the mean of a number of days, the quantity of 

 urine voided in 24 hours by different individuals approaches 

 much nearer to equality. 



The mean of 48 experiments gives 2-795 Ibs. avoirdupois for 

 the quantity of urine voided in 24 hours. 



Haller states it at 3*457 Ibs. 

 Proutat, . 2*300 

 Bostock, ;; . 2-822 

 Bayer, ">j 2-771 

 Lecanu, *'. 2*795 

 Thomson, . 3*333 



Mean, . 2*913, or very nearly 3 Ibs. 



avoirdupois. 



According to Becquerel,f the mean quantity of urine in 24 

 hours, is, 



* Jour, de Pharmacie, xxv. 695. f Semeiotique des Urine, p. 6. 



