276 PEOCEEDINGS OP THE AMERICAN ACADEMY 



Analyses of samples of both potassic and sodic nitrites, made in 

 accordance with the above modification, show that results agreeing 

 very closely with one another can easily be obtained. 



Potassic Nitrite Solution. 



[One litre contained 4.3550 grammes.] 

 Taken. KNO, found. 



25 C.C. = 0.1089 gramme 0.09194 gramme = 84.44 % 



35 c.c. = 0.1525 " 0.1289 " 84.48 % 



40 c.c. = 0.1742 



55 c.c. = 0.2395 '^ 



60 C.C. = 0.2613 " 



Sodic Nitrite Solution. 



[One litre contained 3.090 grammes.] 

 Taken. 



25 C.C. = 0.0919 gramme 0.07713 gramme = 83.95 % 



35 c.c. = 0.1287 " 0.1082 " 84.07% 



45 C.c. = 0.1654 " 0.1390 " 84.05% 



53 c.c. = 0.1949 " 0.1639 " 84.03% 



60 c.c. = 0.2206 " 0.1854 " 84.05 % 



The volumetric method for the determination of sulphites is also 

 most unsatisfactory. The study of this subject was therefore given 

 to Mr. R. Penrose, a student in this laboratory. He experimented 

 both with potassic permanganate and oxalic acid as above, and also 

 with iron alum and the permanganate ; but, although many variations 

 of these processes were tried, and tlie work carefully conducted, the 

 results were unsatisfactory. 



