132 Scientific Intelligence. 
substances. An analysis of this showed it to consist of— 
SS ee re 987 
Impurities Si0,, O,..-....-----.------- 13 
100°0 
By the same process, using sesquioxyd of chromium in plated 
molybdie acid, chromium was obtained possessing 4 Sp. 8 ie 
The best results were procured by using a reducing mixture! 
eyanid of potassium and animal charcoal. Becce 
II. MINERALOGY AND GEOLOGY. ie 
1. A System of Mineralogy: Descriptive Mineralogy com | 
ystem of gy iptios Mina a 
Wiley & Son, No. 2, Clinton’ Place. 10 in cloth.) Mme 
alogy is a growing science, as is very eviden ber 
volume before us. Instead of the 530 pages of ; 
the work, Descriptive Mineralogy here covers 825 pages, & 
Moreover | 
of the letter press is large enough nearly for a quarto ( 
ee 
enough to make four or five ordinary octavo volumes 
The author 3 his preface with several reaso: 
dition to those on the old; fuller as well as completely TeV’ 
a characters ;—to which might be added 250 more | 
In the historical synonymy, as the preface states, © 
