190 HA. Wurtz Contributions to Analytical Chemistry. 
required instead of nitrates, the former acid may be employed, 
Chlorid of cadmium, however, seems to be soluble in chlorohy- ~ 
dric acid. on 
2. On some Improvements in the Preparation of Hard Minerals 
for Analysis. ; 
Read before the American Association for the Advancement of Science, at 
Balti 8. 
e ordinary method of reducing to fine powder by first 
species of unappreciated toil. 
The or 
rating in an agate mortar, is open to several serious objections. | 
bsequently removing the abraded metallic iron from the pow- 
der, without otherwise affecting the composition of the latter, 
step in improvement would have been accomplished. When 
contains no ingredient acted upon by diluted acids, 
he 
