GLUCINUM. 133 



Combining these series into a general mean, we get the subjoined result : 



Awdejew 921. 316, d= 1.577 



Weeren 918.497, i 3.624 



Klatzo 923.281, ziz 1.346 



General mean 922.164, ± 0.985 



Hence GIO = 25.130, ± .0269. 



Debray* analyzed a double oxalate of glucinum and ammonium, 

 Gl(NHJ,C^Og. In this the glucina was estimated by calcination, after 

 first converting the salt into nitrate. The following percentages were 

 found : 



11-5 



II. 2 



II. 6 



Mean, 1 1.433, ± -O^i 



The carbon was estimated by an organic combustion. I give the 

 weights, and put in a third column the percentages of CO.^ thus obtained : 



Salt. 

 .600 

 .603 

 .600 



Calculating the ratio between CO^ and GIO, we have for the molecular 

 weight of the latter, GIO = 25.151, ± .1783. 



In 1880 the careful determinations of Nilson and Pettersson appeared.f 

 These chemists first attempted to work with the sublimed chloride of 

 glucinum, but abandoned the method upon finding the compound to 

 be contaminated with traces of lime derived from a glass tube. They 

 finally resorted to the crystallized sulphate as the most available salt 

 for their purposes. This compound, upon strong ignition, yields pure 

 glucina. The data are as follows : 



Mean, 14.169, dz .0023 



Kriiss and Moraht;}: in tlieir work follow the general method adopted 



*Ann. Chim. Phys. (3\ 44, 37. 1855. 



t Berichte d. Deutsch. Cheni. Gcsell., 13, 1451. 1S80. 



I Ann. d. Chem., 262, 38. 1S91. 



