ON THE BOILING OP MIXED LIQUIDS. 
231 
A remarkable circumstance, and one which is easily ex- 
plained, is, that the gelatine, into which the different pills were 
plunged, which I presented to the Society, does not retain 
the odor of any of them; the same gelatine may, therefore, be 
used for all kinds of pills. 
Journ. de Pharmacie. 
ART. XXXVIII. — ON THE BOILING OF MIXTURES OF TWO 
LIQUIDS, AND THEIR EXPLOSIONS. By M. Magnus.* 
Few things in physics have been so completely examined 
as boiling and the pressure of vapors. Nevertheless, there 
remain some particulars which have not yet been considered; 
in this number are the circumstances which take place during 
the heating of two liquids contained in the same vessel. M. 
Gay Lussac was the first to examine those which took place 
during the heating and boiling of two liquids, which had no 
action upon each other. He asserts that the temperature of 
such mixtures is variable; that the lowest temperature at 
which they can boil is that at which the sum of the tension 
of the vapors of the two liquids is equal to the pressure of the 
atmosphere, and that this temperature may rise to the boiling 
point of the more volatile liquid. 
In determining the boiling point of a mixture of different 
volatile oils, as well as that of carburet of sulphur with water, 
I have found that the boiling point of these mixtures is 
always a little more elevated than the boiling point of the 
more volatile liquid. This temperature is independent of the 
quantity of the more volatile liquid, and remains constant as 
long as there is sufficient of this to pass over in drops. 
The temperature of the vapor, disengaged from the liquid, 
was always inferior to that of the boiling liquid, and this 
* Journ. de Pog, 
