268 Scientific Intelligence. 
sel. The author’s conclusion is that the law of Dalton on mixed gases 
and vapors may be regarded as a theoretical law which would proba- 
bly be verified with all rigor in a vessel the walls of which should be 
formed by the volatile liquid itself of a certain thickness, but this law 
is inaccurate in our apparatus because the hygroscopic affinity of the 
matter of the vessel brings the vapor to a tension which is variable and 
i i ‘bus 
volatile liquids in vacuo, the author finds that two volatile liquids which 
are not capable of dissolving each other give in v a tension of 
f 
acuo 
vapor equal to the sum of the tensions which these substances presept 
separately. It is however only in this case that the law of Dalton 1s 
at 
ence of small quantities of foreign substances which in the case of the 
liquid acid are disseminate throughout the whole mass and therefore 
exert but a slight influence on the tension of the vapor. In the act 
congelation however, the impurity separates from the mass, and there- 
fore must exert a much greater influence on the tension.—Compies 
endus, Xxxix, 301, 391, 345, August, 1854. ; 
siderable quantity by the fractionated distillation of certain varieties of 
. mon a h 
fusel oil 
ie * 
