Chemistry. 113 
oxydize a solution of sulphate of iron had undergone no change what- 
ever. . 
(7) The only method of communicating to perfectly dry oxygen a 
higher activity is electrization. Otherwise oxygen is never capable of 
setting iodine free from iodid of potassium. 
(8. Atmospheric air almost always gives a more or Jess distinct reaction 
With iodid of potassium paper. This arises from various causes as the 
atmosphere is a reservoir for all the gaseous substances which are formed 
bines with iodine or bleaches the blue per. the former we may 
mention oe acid; among the latter, various hydrogen compounds, as 
+ OC, 
(9.) Peroxyd of hydrogen (of Thénard) is not oxydized water, or, as 
Schénbein assumes, HO Q), but a carrier of oxygen of which ali the 
the 
3 a ueing or as an oxydizing agent. According to Heldt, when HO, 
and PbO, are brought in contact, the oxygen given off arises exclusively 
from the H 
= ° from HO,. When hydrate of baryta and peroxyd of hydrogen 
h 
former, 
= of polarity of oxygen is unnecessary.—Die fundamental Higenschaf- 
a des oil und Wasserstoffs. ; 
W. G, 
On the formation of nitrite of ammonium from water and atmo- 
.” Yr under the influence of heat-—The readiness with which a 
at nitrogen 
oe to the equation NH,O, NO,=2N-+-4H0, is familiar to all 
™ Sn bei itro: 
Srammes, acidulated with some drops of dilute sulphuric acid,’com- 
color to iodid of potassium and starch. The reaction is 
cible ge more and sometimes less distinct, and the substance of the eru- 
the ada: RO influence whatever on the result. In a successful experiment, 
SEditio} e curcuma- 
containg or copper still is used for the experiment, the water collected 
pay tarch but with hypermanganate of potash, which is lorized. 
UR. Scl.—Sxconp SeRms, Vou. XXXV, No. 103.—Jax., 1863. 
15 
