48 R.A. Lee—Atomic Weights of Cobalt and Nickel. 
Commercial cobaltic oxide was treated in a large porcelain | 
crucible with enough strong sulphuric acid to make it into a 
stiff paste. The crucible was then placed in a muffle furnace © 
and heated for some time, at first gently and afterwards to low 
redness. The sulphate obtained was dissolved, filtered and sub- 
mitted for some time to a current of sulphydric acid gas, by © 
which copper, arsenic, &c., were removed. The filtrate was 7 
Weselsky and Sommaruga. I first formed cobalti-cyanides of | 
alkaloids having high atomic weights and formin 
it by the walls of the crucible. The hydrogen was int 
duced by a tube passing into the bored cover and the eruct 
