Chemistry and Physics. 57 
influence of the pressure developed, this gas liquefies in the cooled 
short branch. 
have in this way obtained several cubic centimeters of pure 
liquid chlorine. On taking the tube out of the bath, the liquid 
rin 
S 
above 100° C.:—chlorine, ammonia, sulphurous, hydrosulphurie 
and hydrobromic acids, chloride of ethyle and cyanogen. The 
each o e gases can be demonstrated in lec- 
tures when explaining the history of those bodies. 
Reflecting on the feeble thermic effects ascertained by Pouillet 
when pulverulent mineral matters are soaked with water, oil, alco- 
ay or acetic ether, and on the somewhat greater effects exhibited 
With charcoal well freed from gas, heated and cooled in vacuo, 
the heating due to the imbibition of bromine would doubtless be 
‘The volatile liquids condensed in the pores of the charcoal (bro- 
mine, cyanhydrie acid, sulphide of carbon, ordinary ethe and 
alcohol) are’ not expelled, or only partially, by a temperature of 
100° C, at the ordinary pressure. 1 made the experiment with a 
Faraday tube, operating as described for the liquefaction of the 
a A tube filled with charcoal saturated with alcohol does 
not permit any to distil at 100°. 
[The tubes were exhibited to the Academy; and with them the 
me ae experiments (the liquefaction of chlorine, cyanogen, 7 
ave been repeated in berg 
. jences, Oct. 6, 1873. Phil. Mag., IV, lvi, 410. 
8. Rapidity of Detonation.--Prof. Apet and Mr. E. O. Brown 
es during the past ten years conducted a series: of experiments 
gun-cott v us é 
have still to learn of the rties of this material. Its energy 
of explosion varies with aly oa in which it is inflamed ; thus, if 
