390 Royal Institute of France. 
falis off, and the fat of its intestine is then entirely consuined. 
The length of the gut and ifs fat, Sir E. thinks, supply the want, 
of yolk intheova. Mr, Hatchet’s experiments on ova presented 
some curious facts; he found the yolk to consist of oil and a 
peculiar animal matter.’ In some cases the animal matter was 
of a yellow colour indestructible by alkalies, and might be used 
for marking linen; the gelatinous mass is of a nature between 
albumen and gelatin. 
SOCIETY OF ARTS. 
Ventilation of Mines—Ou Wednesday the 23d instant the 
Society of Arts voted their gold medal and a reward of 100/. to 
Mr. Ry:.n, for his improved system for ventilating mines. This 
is the highest honour and pecuniary reward which the Society 
can bestow upon an individual, and strongly marks the high 
sense they entertain of the benefits likely to result from the ge- 
neral introduction of this system into all the coal-mines. Pre- 
judice, ignorance, and mistaken interest, must fall before the light 
of science and the calls of humanity. The original object of 
Mr. Ryan was the prevention of explosions in coal-mines, and 
_the preservation of the health of miners. The safe-lamp of Sir 
H. Davy has effectually accomplished the first—the system of 
Mr. Ryan accomplishes the second; -with this additional ad- 
vantage to coal owners, that they may now work out the entire 
bed of coal, and not leave behind them about one half as pillars 
to support the roof: and this will yield another benefit—the 
roof and floor being allowed to close, the cavity will be so much 
diminished as not to form a reservoir for water, threatening the 
drowning of neighbouring mines, with the death of all the work- 
men, as was the case some months ago in the Heaton Colliery. 
ROYAL INSTITUTE OF FRANCE. 
Analysis of the Labours of the Class of Mathematical and 
Physical Sciences for the Year 1815. By M, Cuvisr. 
CHEMISTRY. 
[Continued from p. 312.] 
M. Gay Lussac has also presented to the class some papers on 
the cold which results from evaporation, and on evaporation in 
the air at different degrees of temperature and pressure, in which 
he expresses, by a formula, the results of his experiments. He 
followed up his last paper with one on hydrometers, which con- 
tains the immediate consequences of the foregoing memoirs; but 
these works not having, as he thinks, as yet acquired that preci- 
sion and order which he has been accustomed to give to all that 
he publishes, he has deferred their publication. 
M. Dulong 
