at the ordinary Pressure of the Atmosphere. 333 
=5= a constant for all values of T and T’ corresponding to 
ae values of fk. 
The annexed diagram represents the ap- 
paratus with which these experiments were 
made, DB an oil-bath heated on a sand- 
bath ; A B a wide tube of some length con- 
taining the solution of the salt; T a ther- 
mometer passing through a perforated cork 
C, and having its bulb immersed in the li- 
quid to within about one- -quarter of an inch 
of the bottom of the tube. A slit is made 
in the side of the cork to keep the vapour 
in the tube at the same pressure as the ex- 
ternal air. Pieces of platinum-foil were put 
in the liquid to facilitate the discharge of 
vapour; and the oil in the bath was time 
after time agitated to keep all the parts of 
the liquid at a uniform temperature. The 
boiling-temperature of pure water corre- 
sponding to the atmospheric pressure was 
first determined; known weights of anhy- 
drous salt, corresponding to 100 parts by te oe 
weight of water, were time after time introduced into the tube, 
and the corresponding temperatures of ebullition were noted: 
the elevations of these temperatures above that of boiling water 
were entered in the following Tables of results. The process 
was continued, in some cases, until the solution of maximum salt 
was nearly attained. A correction for the observed temperatures 
was made on account of the column of mercury in the stem of 
the thermometer not in contact with the liquid. 
2" 
Augmentations of boiling-temperatures, in degrees Centigrade, of 
different solutions of the salts contained in Group 1. 
Corresponding boiling-temperatures of the different solutions of salt above that 
Weight of pure water. 
of salt i in 
Chloride} Chloride 
100 parts Chloride| Carbon-| Value of T |Value of T’ ‘Value of T"| Value of" 
of water,! of so- |of potas-| of ba- | ateof| by formula |by formula |by formula |by pte 
dium, sium, rium, soda, 1 = oe no lay | pee 3, 
4 5 ak rgerer’ T= — 12° 57 * Uy 32 T = at 
0 0 0 0 0 0 0 0 0 
8 1-1 8 ee 4 1:07 yh ae 47 
16 25 1°86 8 i 2-54 1-70 93 1:07 
24 4:2 | 2-93 | 1:4 18 4:22 2:80 1-46 1:80 
32 6:0 4:10 | 2:0 2°5 6°05 4:00 2-05 2°57 
40 8:0 |. 5-34 f 2°6 33 8-00 5°33 2-67 3°14 
48 tae 660 | 33 AO eitheeasii eta Goats 3°30 
= yh eens We come a ie ee eee 3-93 
