SECONDARY COMPOUNDS. 
DIVISION II. 
OF 
SECONDARY COMPOUNDS. 
0OVo 
MANY of the primary compounds, as we have seen in 
the preceding Chapters, are susceptible of forming com 
binations with each other. Thus acids combine with 
alkalies, with earths, and with metallic oxides, and form 
compounds called salts : the earths combine with the 
fixed alkalies and form glass: oils combine with alkalies 
and form soaps. These, to which I have given the name 
of secondary compounds, come now under our considera 
tion. 
The secondary compounds, as far as we are at pre 
sent acquainted with them, may be arranged under the 
five following Classes. 
1. Combinations of earths. 
2. Glass. 
3. Salts. 
4. Hydro-sulphurets. 
5. Soaps. 
These shall be the subject of the five following Chap 
ters. 
223 
Division II.