364 Miscellanies. - 
MISCELLANIES. 
(FOREIGN AND DOMESTIC.) 
Notices Extracted by Professor J. Griscom. 
CHEMISTRY. 
1. Manganese.—Mode of ascertaining the commercial value of 
its ores; by Epwarp Turner, M.D. Prof. of Chemistry in the 
University of London.—The method of manipulating is as follows :-— 
About ten grains of the ore, in fine powder, are introduced into a flask 
capable of containing about an ounce of water, and into its neck is 
fitted, by grinding, a bent tube, about two inches long, which conducts 
the chlorine from the flask into a tube about sixteen inches in length, 
and five eighths of an inch wide, full of water, and inverted in @ 
small evaporating capsule, employed as a pneumatic trough. The 
apparatus being adjusted, the flask is half filled with concentrated 
muriatic acid, the conducting tube instantly inserted, and heat applied 
by means of a spirit lamp. The air of the flask together with the 
chlorine is then collected, the greater part of the latter, if the gas is 
not very rapidly disengaged, being absorbed in its passage ; and con- 
sequently the receiving tube, at the close of the process, will be about 
half full of gas. When the ore is completely dissolved, the last traces 
of the chlorine are expelled from the flask by muriatic acid gas. 40 
order that the chlorine thus collected may be entirely absorbed, the 
aperture is closed by a ground stopper, or still more conveniently by 
the finger, and the gas is well agitated until the chlorine is wholly ab- 
sorbed. As the solution in the inverted tube may become too satur 
rated to dissolve all the chlorine, it is convenient to fill a pipette with 
pure water, and with the aid of the mouth, force a current to asce? 
into the tube, and thereby cause the heavier solution to flow out mto 
the capsule. : 
The absorption being complete, the solution of chlorine is intro- 
duced into a six or eight ounce stoppered bottle, and a dilute solution 
of green vitriol, made, for example, with a hundred grains of the 
crystallized salt and a pint of water, is added in successive small 
quantities until the odor of chlorine just ceases to be 1 
iently 
The quantity of liquid required for the purpose may be conven 
measured in a tube about sixteen inches long, and three fourths of an 
