considered as a peculiar Acid. 
4. Solubility in boiling al- 
cohol. The cold solution of 
camphotic acid was boiled, and 
40 grains more were gradually 
added to it: eight grains of 
alcohol were volatilized. Thus 
92 graivs of alcohol kept in 
solution 146 grains of cam- 
phoric acid, and this solution 
was very fluid. But it may 
fairly be presumed that this 
acid will unite in any propor- 
tion with boiling alcohol, since 
it melts by itself alone with 
heat. This solution goes into 
a crystalline mass at a tempe- 
rature of 2° below zero. 
9. Action of. caloric in 
close vessels. 20 grains of 
camphoric acid were heated in 
a small retort containing an 
ounce of water, until the whole 
“was volatilized. Gradually a 
humid vapour was formed which 
was condensed in the reeeiver, 
and presented two drops of li- 
quid resembling water, which 
had an empyreumatic taste and 
sinell, and at the same time the 
flavour of acetous acid. The 
empyreumatic smell was accom- 
panied with that of turnips. 
The sublimate which was form- 
ed in the neck of the retort 
had this smell also: in short, 
it was a very white saline mat- 
ter, with some brownish spots : 
it was opake, and was not sen- 
sibly crystallized, resembling in 
nothing the crystalline - subli- 
mate which is furnished by the 
benzoic acid. The taste of this 
matter was acidulous and pi- 
quant, which was occasioned by 
the empyreumatic oil, which 
_also diminished a little its solu- 
bility: 
149 
4, 100 parts scarcely dis- 
solve so many of benzoic acid: 
in this respect this acid differs 
much from the camphoric acid, 
since alcohol can dissolve more 
than double its weight of the 
latter. 
5. 20 grains of benzoic acid 
were heated in the same man- 
ner. 
The volatilization was much 
more prompt than with the 
camphorie acid. ~At the com- 
mencement there appeared a 
slight current of white vapours 
which were condensed in the 
neck of the retort, under the 
form of a whitish dust, weigh- 
ing about half a grain; after- 
wards the acid was sublimed as 
usual in the form of beautiful 
white demi-transparent needles. 
There was but a very slight 
trace of empyreumatic oil, and 
charry matter, but not the 
smallest vestige of humidity ; 
the interior of the retort and 
of the receiver had a slight 
smell of benzoin. All these ob- 
servations are very different 
from those presented by the 
camphoric acid, when it is 
sublimed; and certainly they do 
not proceed from an excess of 
oil, as Doerfurt pretended, 
K 3 
