Chemistry and Physics. 143 
the first time by Cailletet—at 4° being forty-six atmospheres, its 
liquefaction taking place at a pressure a little less than that of 
acetyle 
e. 
a subsequent paper, CAILLETET announces the liquefaction of 
nitrogen dioxide, by a pressure of 104 atmospheres at —11°. At 
> Rha ae Bigg 
u 
and so remained up to a hei ht of four or five centimeters, Teach- 
ing 650° at the height of six centimeters. Mixtures of air and 
Sid in a Bunsen burner closed below, and the 
temperature measured in the hottest part of the flame. For one 
one volume of gas and three of air, 1116° ith four volumes 
of air the mixture would no longer burn in a Bu ; 
and burned from a at-wing burner gav mapera- 
and one-half CO,, a temperature of 1000°; one volume gas and 
two of CO, gave 860°; moe with three of CO, 780°. With four 
Hommes CO,, the mixture burned only in contact with a flame.— 
az. Chim. Ital., vii, 422, Sept. 1877. 2, 2 Sa 
5. On the nciple of Maximum Work, as illustrated by the 
Spontaneous decomposition of Barium perhydrate.—As & funda- 
