148 ~ On the Camphoric Acid; 
that it requires 400: it ap- 
proaches that of Bouillon-La- 
grange ; for he had announced 
that this acid is dissolved in 80 
parts of water. 
If the above chemist has de- 
termined the quantity of acid 
kept in solution im water, by 
estimating what might be re- 
tained by a warm solution of 
this acid, when its temperature 
has fallen back to a lower one, 
he would have been right ; for 
we know that similar solutions 
of salts constantly retain more 
salt than the water could dis- 
solve at a temperature equally 
ae 
2. Solubility in boiling we- 
ter. One ounce of water, was 
heated in a large vase to the 
boiling point, then camphoric 
acid was added until no more 
solution took place, and the 
whole was speedily weighed. 
It required nearly eleven parts 
‘of boiling water to dissolve one 
of camphoric acid. This resuit 
forms a mean between that of 
M. Bouillon-Lagrange who says 
that it requires 10, ~and Kose- 
garten who asserts that it re- 
quires 12 
3. Solubility i in cold alcohol. 
100 grains of alcohol were 
shaken with camphoric acid 
until the latter refused to dis- 
solve at a temperature of 15° 
Reaumur. 106 grains of acid 
were dissolved: the liquor was 
of the consistence of a clear 
syrup. 
A, Solu- 
at least 400 parts of water are 
requisite to dissolve one part of 
benzoic acid, 
2. The benzoic acid wher 
treated in the same manner af- 
forded a result which differed 
very little from that of the other 
chemists ; for I found that it 
required 242 parts of boiling 
water to one of benzoic acid. 
Lichtenstein and Doerfurt have 
announced that 24 are requi- 
site, and Trommsdorf has said 
80. The benzoie differs con- 
siderably, therefore, from the 
camphoric acid in this pro- 
perty. 
3. The same quantity of al- 
cohol when shaken three times 
longer with benzoic acid could 
only dissolve 56 grains of it. 
This alone is sufficient to de- . 
monstrate the difference which 
exists between these two acids, 
since it must be admitted that 
it is the presence of the essen- 
tial oil of benzoin which op- 
poses the solution of the acid, 
this essential oil being very so- 
luble in alcohol, 
4, 106 
