By Pror. EMERSON REYNOLDS, M.D. 39 
The quantity of pure dry urea operated with in each of the 
following experiments was 2°222 grains, and the same volume 
(i.e. ten fluid drachms) of a single sample of freshly prepared 
sodic hypobromite was added in each case. The experiments 
were completed within three and a half hours, and care was 
taken to avoid changes of temperature as much as possible; 
hence, while the barometer remained steady at 30°06 inches, the 
temperature varied within such very narrow limits (between 50° 
and 52° F.) that corrections for alterations of volume were un- 
necessary, aS extreme accuracy in the measures of the water 
expelled was not attainable with the vessels advisedly employed, 
as I desired the results to be of such a kind as a medical man 
could easily obtain in his own study. 



TABLE. 
Experi- Pure, dry Urea Volume of Water Volumo of 
ment used in used to dissolve Water expelled 
No. Experiment. Urea in A. from F, 
1 2°222 grains, .| Odrachm,- . | 153 drachms. 
2 ” l ” 15 ” 
3 ” 2 ”? 14% ” 
4 >» 2 Lh irnil' ss 
5 é rai. Ase 
6 99 3 7? 145 9? 
7 ”? 4 ” 14% ” 
8 Ff 5 v Lost. 
9 ” 6 ry) 14 + ” 
10 . Cie ety 
1 i ” 8 7 13% ”? 
12 * 4] he 132+ ,, 
13 LOLS 1324 ,, 
The weight of urea taken for each experiment is capable of 
affording a volume of moist nitrogen gas at the temperature and 
pressure above stated, which would expel 15éth drachms of water. 
The maximum volume obtained from that weight of pure dry 
urea was 15th drachms. Thus there is a minimum loss of 3:3 
per cent. The maximum observed loss in the foregoing experi- 
ments amounted to 149 per cent., and occurred in the experi- 
ment in which the above-named weight of urea was dissolved in 
ten drachms of water. The loss within the above limits is 
