COMBINATIONS OF CAMPHOR, ETC. 
213 
diminished, and after twenty-four hours it was hardly per- 
ceptible, that of the assafoctida alone remaining. The experi- 
ment was repeated with other substances in the same state of 
aggregation. At first with the following gum-resins: galbanum, 
sagapenum, olibanum, opopanax, tacamahaca, euphorbium, 
bdellium, gamboge, myrrh, scammony, ammoniac; then with 
anime, sandarach, mastic, dragon's-blood, the resin of guaiac, 
of scammony, of jalap, with rosin, colophany, balsam of Tolu 
and benzoin, with amber, and finally with the resinoid matter 
of cinchona.* 
Experiments so simple do not admit of any details of ma- 
nipulation, but the question embraces two orders of phenomena, 
which it is indispensable to point out, to wit, the state of 
aggregation or division of each mixture, either immediately 
after the experiments, or after a certain lapse of time; and 
the intensity of the odor of the camphor, of which the degree, 
from not being capable of being determined by the smell, is, 
in fact, somewhat arbitrary. It would be tedious, from the 
number of substances passed in review, to give for each a 
detailed description of the phenomena observed, and it would 
too much lengthen this article. 
I have, then, adopted the plan of establishing two categories 
corresponding to the two orders of phenomena indicated, and 
of dividing them into several groups, without regard to the 
nature of the substance added. 
The first category comprehends five groups, each one of 
which contains the mixtures that present an apparent resem- 
blance, at least, as regards consistence, division, hygrometric 
power, &c. The second category, formed of the same mix- 
tures as the first, comprises three groups. To the first, 
appertain the mixtures in which the odor of camphor is 
entirely absorbed; to the second, those which feebly retain 
the odor of this substance; and, finally, in the third group, 
those that exalt the odor of camphor, or powerfully retain it. 
* All these substances, with the exception of anime and sagapenum, 
were employed in powder. The camphor, reduced by means of alcohol, 
was exposed to the atmosphere for a day before making the mixtures. 
vol. iv. — no. in. 28 
