188 Academy of Useful Sciences at Exfurt, Fe. 
syrup, which he effected by means- of extracting the juice, 
clarifying it with the whites of eggs, and afterwards evapo- 
rating it to the consistence of syrup. The other memoir is 
by M. Gogo, who has extracted a sweet and agreeable oil 
from the kernel of common hazel nuts. 
ACADEMY OF USEFUL SCIENCES AT ERFURT. 
At the meeting of the above society, on the 5th of April 
last, professor Bernhardi afforded some new ideas upon the 
double refraction of the rays of light by means of gypsum. 
M. Haity, and still more recently M. Brisson, had observed 
this property, but not with sufficient accuracy: in general, 
the surfaces were not parallel to each other; the angle they 
formed, and the direction taken by the images, were not 
earefully determined. 
M. Bucholz communicated the results of his researches 
upon the seeds of /ycopodium. His experiments present the 
following results : 
1, These seeds contain a sixteenth part of a fat oil of a 
brownish yellow, and soluble in alcohol, 2. A portion of 
real sugar. 3. A viscous extract of a brownish yellow, and 
an insipid taste. 4. The residue, after being treated with 
alcoho] and water, may be regarded as a peculiar product 
of the vegetable kingdom. 5. The yellowish aspect of the 
seed in this latter state indicates the union of a species of 
pigment with the first principle of the seed, or at least a 
very intimate union of the constituent parts of this seed. 
6. The oily part which enters into the composition of this 
seed occasions its lively combustion, and its constant sepa- 
ration from water. 
ROYAL ACADEMY OF SCIENCES OF BOHEMIA. 
The above academy has announced a prize of 100 ducats 
of gold, for.the best memoir upon the processes for ame- 
liorating the races of Tartar, Moldavian, Transylvanian, 
Hungarian, Polish and Bohemian horses: a second prize 
will be also adjudged to the best memoir upon the advantages 
or disadvantages attached to the employment of Hungarian 
horses and mares in the cavalry, 
XXXII. In- 
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