

- OF Till: AMI!!;!' an A.CADEMY. 



ii nation of the arsenic could be predicated from 

 the fon ation. 



To 3am ap, then, we think that small amounts of arsenic can be 



ir method without danger of interference from bdI- 



jilnir, phosphorus, and antimony, provided the solution to be tested is 



irefully ;i> possible from these substances and the additional 



precaution is taken to place a strip of lead acetate paper in front of 



From the comparative rarity of the hydrides of selenium and tellu- 

 rium and the unlikelihood of their occurrence in ordinary practice, we 

 have made no study of their action on mercuric chloride pajK3r. One 

 would Buppose from analogy, also, that the reactions in small amount 

 imilar to that of hydrogen sulphide. We note in this con- 

 iilicim 31 states that hydrogen selenitic has do inllu- 

 • on the Gutzeit test, unless in large quantity, if lead acetate paper 

 ■ 1. 

 The results of the above experiments are tabulated for comparison 

 Hows : 



TABLE II. 



Ri \. n i oloh Bauds within the Ran<;f. of the Absbbic Stahdabm 



prom Approximati i j Eqi ivm.i.m Amounts of An-iM.. Stibinb, Pbosphinb, 



D 1 1 -i DROGEB SULPHIDE. 



31 Chem. News. 83, -277 (,1'XH). 



