Analytical Chemistry. . 117 
per. From the experiments of Lippert it now appears that the crust in 
feed far-the largest portion of the arsenic is therefore kept out of 
sig 
For the details of this interesting research and the author's discussion 
: K «tats 
nal fiir prakt. Chemie, Ixxxi, 168. 
Saponi fication by alkaline carbonates in the dry way.—As an addi- 
uneboaged while a true soap is formed. Thus, when a mixture of 100 parts 
of tallow and 22 to 25 parts of carbonate of soda is ually heated, 
a lively reaction commences at about 260° (C.) [=500 (F. ], the mass 
swells up while an abundant evolution of gas occurs :—in order to pre- 
vent loss it is necessary to conduct the operation in a spacious retort and 
to moderate the heat as soon as the reaction has once begun; if in addi- 
