Chemistry and Physics. 277 
posed; among the products of their decomposition the author has dis- 
covered an ammonia-chromium base which has the formula Cra03.4NHs, 
The constitution of the salts of this base may be represented by the 
neral expression Cr203.4NH3-+-3A, in which A represents one equiva- 
lent of acid. The solutions are almost pure rose-red—the chlorid, which 
the author considers as a hydrochlorate, has the formula Co2O3. 4NIIs 
38HCI. The salt crystallizes from an acid solution in the form of beautiful 
regular octahedrons ; it forms crystallizable double salts with the chlorids 
of platinum and mereury. In addition, the author has discovered two 
nag salts, which appear to contain different bases.— Comptes Rendus, 
xlvii, 883, 
according to experiments made at the Polytechnic Institute at a. 
slightly soluble i 
When treated for a long time with 
a i ved into c rine 
and acid which remains united with the alkali. The author concludes 
from his analyses, that the true formula of cholesterine is that of Ger- 
hardt, viz, : 4402, nine in combining with acids loses four 
equivalents of water: the author succeeded in prepariag a benzoate and 
stearate. He farther points out the relations which exist between meco- 
e farther poin 
