66 Scientific Intelligence. 
mixed in the proportion of 2:1, do not combine under these cir- 
>] 
cumstances even when submitted to the action of the silent dis- 
arsenous oxide, iodine, and even nitrogen. Carbonous oxide on 
the other hand, mixed with half its volume of oxygen, left after 
twelve hours only eight per cent uncombined, mixed with t 
per cent of oxygen; i reury. 
part of the CO had formed a brown oxide C,0,. Carbon dioxide 
under the action of the silent discharge, in a space free from 
oxidable bodies gives results which lead the author to suspect the 
existence of a percarbonic oxide CO,. In one experiment, after 
twelve i 
vigor. This cannot be ozone since in that case from thirty to 
forty-one per cent of the oxygen set free would have been con- 
verted into this substance, an unheard of proportion. The new 
ody has not been isolated.—Ann. Chim. Phys., V, xvii, 142, 
May, 1849. 
which might cause serious error in organic analysis; this result 
having been questioned by Thudichum. The copper to be tested 
extraneous moisture. It was found that this occlusion actually 
took place, and that the pulverulent metal formed from the oxide 
becomes denser by successive heating. A carefully conducted 
experiment showed the occlusion of 0-035 gram of hydrogen by 
h, it appeared that the 
nely divided metal on © 
reduction, whic not occlude hydrogen. Moreover the 
author found that the copper thus hyd 
sium chlorate to chloride, and when ignited in CO, reduced it to 
JO. Heated in CO or in N, all its occluded hydrogen is given 
fon 
3 
5 
m 
So 
my 
oO 
Me 
(ae) 
“4 
od 
=| 
e 
2 
a 
| 
& 
oO 
5 
ft 
up. Heat 
author therefore concludes that it is unsafe to employ copper 
freshly reduced in hydrogen for the reduction of oxides of nitro- 
gen in organic analysis unless the metal be previously ignited in 
nitrogen gas.—J. Chow. Soc., xxxv, 232, May, 1879. @. F. B. 
4. On the Composition of Charcoal from pure Cellulose.— 
Berruexor has examined the charcoal produced from the pith of 
the spindle tree (Hwonymus) in the process of earbonizing this 
ies 
