1885.] 



Limited Hydration of Ammonium Carhamate. 393 



Intervals of five minutes 



bromite, and let V 3 represent the volume of nitrogen given off: 

 (corrected) . 



Let x=. volume of nitrogen due to urea. 



yz=z „ ,, ammonia. 



„ z = ,, ,, carbamic acid. 



Then (1.) x + y.+ z=V v 



(2.) | + y=V 8 . 



(3.) z=% 



A preliminary trial of this method with a mixture of urea and 

 ammonium carbamate gave very satisfactory results. 



It appears to me that no really satisfactory method has hitherto 

 been known by which carbamic acid could be detected and estimated 

 in presence of urea and ammonia, so that the process indicated above 

 may perhaps be of service in investigations bearing on the formation 

 of urea in the animal body, and its origin, whether carbamic or 

 otherwise. 



VOL. XXXIX. 



