384 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



From Ag ratio, Se = T9.288. 

 From AgCl ratio, Se= 79.328. 



Secondly, ammonium bromoselenate was studied. From this salt the 

 selenium was precipitated by hydroxylamine hydrochloride, and then 

 collected and weighed in a Gooch crucible. The vacuum weights and 

 percentages of selenium follow: 



Am^SeBr^. Se. Per cent. Se. 



1.00059 .13324 13.3161 



1.50153 .20022 13.3344 



2.00059 .26649 13.3209 



2.00126 .26657 13.3201 



3.00125 .39958 13.3138 



4.00216 .53346 13.3293 



5.00218 .66656 13.3254 



5.03001 .66998 13.3196 



Mean, 13.3224, ± .0017 

 Hence Se= 79.25. 



Steiner's ' determinations, two in number, were made incidentally to 

 his work on tellurium. Phenyl selenide was burned in a combustion tube, 

 and the carbon dioxide so produced was weighed. To his figures T add 

 the ratio (CeHJoSe : 12C0, :: 100: a;; 



Selenide. CO.. Ratio. 



.2812 .6375 226.707 



.5371 1.2158 226.365 



Mean, 226.536, ± .0485 



Hence Se = 78.97. This determination is of trifling significance. 



Julius Meyer '^ analyzed silver selenite electrolytically. The silver was 

 precipitated from a solution of the salt in potassium cyanide. With 

 vacuum weights the data are as follows : 



Ag^SeO,. Ag. Per cent. Ag. 



.5152 .3241 62.907 



.5237 .3295 62.915 



1.6964 1.0672 62.910 



1.8793 1.1826 62.928 



2.1460 1.3503 62.922 



Mean, 62.9164, ± .0082 



' Ber. Deutsch. cheni. Ges., 34, 570. lOOl. 

 "Ber. Deutsch. cheni. Ges., 35, 1591. 1902. 



