266 Scientific Intelligence. 
on 
bisulphid of carbon, but difficult to get pure ether and alcohol, while 
chloroform always contains many substances mixed with it which canno 
be separated. Thus the tension of its vapor as directly determined 
was 342-2 at 36°, while by the method of ebullition it was found to be 
313-4 at the same temperature. Some liquids change their molecular 
structure when long boiled under high pressures, and of this change oil 
of turpentine furnishes a remarkable example. ther liquids appear 
to undergo molecular changes when left to themselves for a long time 
in hermetically sealed tubes: ether is a curious instance of this. 
With respect to the second part of the subject, as indicated above, 
through the cover of which four closed tubes passed, two into the liquid 
his results, of which however our limits permit us to give but one. In 
w 
the vapor would have had if it had been produced by distilled water 
boiling under the same pressure. 
i 2 
5 3. 4, : ah 9. 3. 4, 
° ° ° 
82:52 52:0 47°88 47°84 457-22 99.88 99°90 
13661 6158 68-20 5816 180715 12986 12663 12616 
21944 ‘180 . 6878 68°61 218235 13680 13292 18242 
286°43 44-94 84 270213 14279 14085 13981 
43419 8754 85:09 85:07 312369 14791 145°57  145°00 
It will be seen from this table that the thermometer plunged into the 
ic 
corresponds to the vapor of pure water under the same pre 
small difference may be attributed to radiation from the hotter liquid 
and to small drops of liquid projecte the boiling saline soluti 
found that, at a distance of 3 or 4 centimeters above the surface of the 
‘Solution, the thermometer was always wetted and consequently 
licate the temperature of the vapor of pure water.. When 
pee 
is 
