196 A. A. Hayes—Red Oxide of Zinc of New Jersey. 
_ three days the rolls were removed, soaked in successive por- 
tions of water, and opened. The inner surface of the roll was 
covered with a lustrous film, composed of transparent scaly 
particles of a general light brown color, highly reflective an 
in part transparent. The siliceous skeleton and partly decom- 
oa mineral connected with the iron scales was thus obtained. 
en the solutions from the rolls had reposed for eight days, 
oe and nacreous scales 
process has also been tried, and even the beautiful sai neatly 
erystallizing double zinc and manganous and ammonium su! 
phate retained portions of the mineral, after graduated erystalli- 
zation. The best and most instructive mode of action adopted 
is the following : 
Both ammonium chloride and hydrate dissolve the ore, and 12 
the air the manganous deutoxide forms and separates. Rui 
pass hydrogen gas though a solution of the ore, from which 
scales of specular iron and silica have been separated, contain 
in a two-tubulated flask, ammonia chloride and hydrate in eX 
cess being added, the oxides first precipitated dissolve. After 
ose, the clear solution may be removed by pressure of the 
gas, leaving a mere flock of ferric deutoxide. If silica is present 
it dissolves in the zine solution with the other bodies, and 1% 
may be stated here that the substances sought for are so small 
a part of the whole weight that, in presence of the mass of zine 
oxide, re-agents generally fail in separating them. By plactag 
