254 Review of Dr. Antisell’s Work 
the latter not more than two or three hundredths of a millimeter 
on the edge, translucent, and of a splendid garnet red color. | 
On examination it became evident that these two bodies had 
been deposited in the crystalline state in consequence of the 
formation of the so-called’ “ Bucholzian circuit "—one solid and 
two liquids so arranged as to produce electric action. As the 
flask cooled down the water from the peneumatic trough gradu- 
ally rose in the tube, and in time ran down into the flask. The 
latter being in an inclined position the water flowed gently down 
the neck and formed a distinct stratum above the strong solution 
of nitrate of copper. me of the scraps of metal which ha 
rojected above the surface of the solution, were now immersed, 
partly in the latter and partly in water, and it was upon the low- 
er portion of each of these scraps—the part immersed in solution 
of raat of copper—that crystallization had taken plac 
“a pier 
he deposition of metallic copper under similar conditions 
touching some protoxyd of copper at the bottom of the solution. 
The crystals which he obtained were octahedral, not cubic. 
—- 
Art. XXVIL.—Review of Dr. Antisell’s Work on Photogenic Oils, &e. 
[Concluded from page 121.] 
In describing the methods of purification proposed by Selligue, we shall 
make no attempt to follow their various details, our limited space compelling u8 
to content ourselves with only the broadest generalities. Selligue sets forth 
at length two methods: Ist. A cold treatment which consists in agitatl 
the oil with sulphuric, muriatic, or nitric acid. This agitation should be 
a) 
description of his agitators. After several hours’ repose, the oil may be 
‘pert tgee ned in the oil. The oil is then decanted: if it is te 
distillation of the crude oil I do not allow the mixture to subside entirely, Py 
ng to leave a portion of the alkali mixed with the oil, and to distil off only 
than i _ When the soda lye—in quantity slightly ates od 
han 1s necessary to neutralize the acid—is added, the liquid must be agita' “ef 
Rg in order that each particle of the oil may be brought in contact it 
pe 9 Bh agitation must be continued until the color of the oil und? 
