Chemistry and Physics. 371 
noso-manganic oxide, and lead peroxide, cause the evolution of 
oxygen at temperatures varying from 240° to 360°. The author 
observed that fine division facilitated the action, precipitated 
oxides acting more efficiently than those prepared by calcination ; 
that, while the effect of even is noticeable, yet that from 4 to 
4 of the oxide is the most efficient quantity ; that with these mix- 
tures the rapidity of the decomposition is proportional to the tem- 
perature; and that no chlorine is evolved below 300°. Moreover, 
certain substances, which act chemically on the chlorate, decom- 
t even lower temperatures. Thus chromic oxide causes 
Ww 
and a complete transformation into potassium chromate is 
effected below 290°. Stannic, tungstic, silicic and boric oxides 
act similarly. Baudrimont attributes the result, in the case of 
cupric oxide and allied bodies, solely to the action of presence or 
contact; the point of fusion of the mixture being ten degrees 
lower than that of the unmixed chlorate.—Moniteur Scientifique, 
xi, 783, Nov. 
5 
result in nicotine- isoning. They examined a smoking tobacco— 
i it, one part 
* pipe, the other made up into cigars, and drawing the smoke— 
ases, The gaseous products were found to consist of oxygen, 
nitrogen, Sarbonie ose and marsh gas. An oily verni-aglid sub- 
afforded, when disti Te tant ‘ oti & 
: istilled, an oily liquid of sp. gr. 0°8, apparently 
ede of hydrocarbons of the penesl series, and a solid, in pearly 
Taig having the composition C,, H,,. ‘The potash-soluti 
illed, and the distillate was added to the sulphuric acid solu- 
