ADDITIONS AND NOTES TO VOL. I. 497 



of soda, at a temperature of from 40 to 50, while the urea is 

 not decomposed by such treatment. Proceeding in this way, 

 Boussingault found 0'034f of ammonia in the urine of a child 

 aged eight months, and 0*1 14 in that of a youth. It is, how- 

 ever, very questionable whether the nitrogenous matters of the 

 urine, as, for instance, its coloured extractive matters, which are 

 decomposed far more readily than urea, may not, under these 

 conditions, develope ammonia. At all events it would be remark- 

 able if, after the use of the salts of ammonia, we were to find (as 

 Bence Jones has done) not these salts, but their highest product 

 of oxidation in the urine, while, when these salts have not been 

 taken into the organism from without, the ammonia formed in the 

 body should not be decomposed, but should pass off as such in 

 the urine. Moreover, it is not impossible that the ammonia found 

 by Boussingault may have been formed within the body. 



END OF ADDITIONS AND NOTES TO VOL. I. 



VOL. III. 2 K 



