at the ordinary Pressure of the Atmosphere. 337 
Hence it appears that the same law holds (approximately) true 
for these two salts. 
For the nitrate of lime and the carbonate of potassa included 
in the fourth group, we have 
a = - =°87, for all equal weights of the salts ; 
but 
Equiy. carb. of potassa _ 69 
Equiv. nitrate of lime ~ 82 — 
In this case, for all equal weights of the salts, the boiling-tem- 
peratures, T and 'T’, are (approximately) zn the inverse ratio of the 
equivalents of the entire salts. 
How far these laws may be extended to other substances 
future researches will determine; at the same time it must be 
observed that it is quite consistent with analogy to suppose that 
the chemical composition of a substance should affect the boil- 
ing-temperature of its solution. Although the law here indi- 
cated is not strictly true, yet it is sufficiently exact to warrant 
further inquiry, and the cases to which it is found to apply are 
too numerous to be referred to accidental coincidence. 
— ‘84, 
On the boiling-point of diluted sulphuric acid. 
With the exception of the sixth, seventh, and ninth experi- 
ments, the following experimental results were given by Dalton. 
The per-centages of concentrated acid in the liquids were calcu- 
lated from the observed specific gravities of the liquids by means 
of Ure’s Table, given at p. 801, fourth edition, of his work on 
the Arts and Manufactures. 
Augmentations of the boiling-temperatures, in degrees Fahrenheit, of 
diluted sulphuric acid at mean atmospheric pressure, containing 
different proportions of concentrated acid in 100 parts, the 
specific gravity of the concentrated acid being 1:846. 
Weight of con- | Corresponding Value of k | 
a ee 
the liquid, above 212°, k=14:15 TS, 
k. T. 
100 353 100-30 
96:21 Bits) $8.08 
93°66 289 93°59 
90°53 261 90-43 
| 86°82 223 85°81 
76°88 190 73:18 
48-00 40 48-39 
: 41-00 28 42°S6 
34:00 16 35°66 
0 0 0 
Phil, Mag. S. 4. Vol. 21. No. 141. May 1861. Z 
