214 Meissner’s Researches upon Hlectrized Oxygen. 
The apparatus used to establish the first point, consists of 
two pieces, the first of which is intended for the production of 
chemically pure oxygen, the second for the electrization of this 
oxygen, and its subsequent analysis. We have space here for 
oply a prea Seoangace of these marvellously accurate speci- 
s of Geissler’s glass-work, referring those specially interest- 
éd in the peed lates. The oxygen is evolved b Seakay 
sis from saidiiatat water contained in a U tube, and then pass 
es through a second U tube filled with bits of olass moistened 
with sulphuric acid, then through a straight tube filled with 
oxydized copper- turnings to which heat can be applied, then 
through a second U tube containing glass and sulphuric acid, 
and finally through a horizontal tube a foot in length, contain- 
ing anhydrous phosphoric ae = Den collected, after passing 
an ingeniously-constructed m -valve, in a receiver over 
mercury. All these tubes are Jone. either by fusion or by the 
most carefully ground joints. By means of the heated copper 
oxyd, the hydrogen, which, by diffusion or mechanically, may 
mixed with the oxygen,—as well as the ozone produced by 
the electrolysis, ot the vapor of hydrogen peroxyd—if any 
there be—are destroyed. The entire apparatus is first washed 
out with several liters of pure oxygen chemically prepared, then 
with 16 liters of the electrolytic oxygen; after which the inhi 
being assumed pure, is collected. The second pices of appara- 
has a tube filled with sirens teeth acid in this posi- 
tion. rao in the former, Siemens’s tube, in the latter 
von Babo’s, s used for the electrization. With these vee 
tions s they are alike; a description of one suffices. 
apparatus vps pure oxygen, it is t seouile Sat the 
— “eee ame v4 one oo 
ith the omens gradua po the electrizing tu us 
thi submitted to the action of the 
* The Sictidlng Whe of von Babo is described in Prof. Johnson’s abstract 
above alluded to. 
