224 Royal Academy of Sciences of Paris. 
proof fabrics shown. The latter were prepared by Mr. Han- 
cock. x 
Feb. 10.—The progress made by Mr. Brunell in his appli- 
cation of the condensed carbonic acid to the construction of a 
mechanical engine was described to the members by Mr. Fa- 
raday, and stated to be highly favourable. 
Feb. 17.—Mr. Griffiths’s experiment on the state of alkali in 
glass, Mr. Varley’s single adjustable microscope, Mr. Brant’s 
large bar of palladium, and a South American Geological 
series of specimens were shown and explained in the library. 
Feb. 24.—Mr. Varley explained the nature of his graphic 
telescope intended for the use of artists. It combines magni- 
fying powers with the properties of Dr. Wollaston’s camera 
lucida. 
Mar. 3.—The art of lithography was illustrated by nu- 
merous operations, and its minute chemical and mechanical 
principles explained by Mr. Faraday, and Mr. Hullmandel, 
who furnished the beautiful specimens shown. 
Mar. 10.—Mr. Brande entered into the chemical history of 
wines as respected the alcohol contained in them; and showed 
the state of combination ‘in which it was retained, the conse- 
quent loss of part of its power, and the most perfect modes of 
analysis. Some specimens of unadulterated port and very old 
hock were operated upon. 
ROYAL ACADEMY OF SCIENCES OF PARIS. 
Nov. 7, 1825.—A letter from M. de Gregori was read, re- 
lative to the success of vaccination in the Piedmontese states. — 
M. D’Hombre-Firmas communicated a memoir on a great de- 
pression of the barometer observed at Alais in October last.— 
Dr. Rouzé presented a memoir in manuscript, entitled, An ex- 
planation of the famous problem of general electricity.— Dr. 
Candiloro, of Palermo, presented a memoir, entitled, Medico- 
chirurgical reflections on the quickest and surest means of ex- 
tracting calculi from the bladder.—M. Latreille was appointed 
to make a verbal report on M. de Blainville’s work, entitled, 
‘‘ Manuel de Malacologie et de Conchyologie.—M. Dupuytren 
read the second part of the report of the committee appointed 
to examine the memoirs on the yellow fever and on the plague. 
—M. de Ferussac read a memoir, entitled, A methodical table 
of the class of Cephalopoda, presenting a new classification, by 
M. Dessalines d@’Orbigny, jun. 
Nov. 14.—M. Paul Laurens communicated a memoir on 
aérial perspective-—M. Lejeune d’Irichlet communicated a 
supplement to his memoir on the impossibility of some inde- 
terminate equations of the fifth degree—M. Amussat com. 
municated 
