PARIS. Academy of Sciences, July 11.—M. Mascart in the chair.— Thermochemical investigation of the solution and polymerisation of cyanogen: M. Berthelot. Potassium cyanide has considerable thermal effect on a solution of cyanogen whether in water or alcohol.—Note on the heat of transformation of black crystalline sulphide of antimony into the orange coloured precipitate: M. Berthelot.—Condensation of glycol bromoacetate with acetoacetic and acetone dicarboxylic esters: A. Haller and F. March.— Origin in food of the arsenic normally found in man: Armand Gautier and P. Clausmann. Practically all food materials, particularly fish, contain traces of arsenic, the total arsenic received by an average man in a year being 7.66 mg.—The relation between external work and total expenditure of energy in a muscle in dynamic contraction, when the muscle is doing negative work, against the fall of a load, by gradually elongating as the load falls: A. Chauveau. It is concluded that the expenditure of energy is greater in negative work than in fixed contraction, but less than in positive work under the same conditions of load, stimulus, &c., and that in negative work the expenditure of energy increases more rapidly, when the work is increased by increase of load, than by increase of movement. —Note on a new method of observing n-rays: R. Blondlot. —Analysis of the ashes contained in the urns of Materpa (Thebes, eighteenth dynasty): MM. Lortet and Hugoumenq,—Regulation of watches at sea by wireless telegraphy: J. A. Normand.—The academy appointed MM. Mascart, Troost, Moissan, Guyon, and Lacroix to assist at the inauguration of the Pasteur monument in Paris.—Two problems on isothermic surfaces: L. Raffy.—Explosion waves: E. Jonguet,—Kathode rays and magnetofriction; reply to Villard: H. Pellat.—Note on the refractive indices of solutions: Edmond Van Aubel.—The relation between the pressure of a gas in a vacuous tube and the length of the spark produced: Gaston Seguy. As the pressure decreases in geometric progression the length of the spark increases in arithmetic progression.—The densities of sulphurous anhydride and of oxygen: Adrien Jaquerod and Alexandre Pintza. Morley's method of weighing the gas by the loss in weight of the generating apparatus was used with concordant results in the case of sulphurous anhydride.—The heat of combustion of organic sulphur compounds, and a note on that of compounds containing halogens: P. Lemoult. Results of experiments are compared with those obtained by calculation according to the position of the sulphur.—Reactions of the esters of 2:3-butanonic acid. (1) Action of phenyl hydrazine: L. Bouveault and A. Wahl. The phenyl hydrazone obtained in the cold is proved to be that in the 2-position by the formation of the paranitrophenyl hydrazone of methyl phenyl acetopyrazolone previously obtained by Bülow.—Researches in the pyrane series: E. Blaise and H. Gault.—On some phenolic ethers of the pseudo allyl chain R—C(CH3)=CH2: MM. Behal and Tiffeneau. These bodies are obtained by the magnesium methiodide reaction on the corresponding esters, using one or two molecules in excess of the magnesium methiodide, and are intermediate between the corresponding allyl and isoallyl compounds in boiling point, density, and refractive index. —Action of traces of some salts, and of caustic alkalis on diphenyl carbonic ester: R. Fosse.—Mechanism of the action of the cytoplasm in seeds during germination, and the synthetic realisation of this mechansm in vitro: Maurice Nicloux. The development of acid in oily seeds, when germinating, is proved to be due to the hydrolytic action of the cytoplasm on the oil. The name lipaséidine is proposed for the active substance in the cytoplasm. The action requires some acid to start it, but CO2 is proved by experiment in vitro to be sufficient, and CO2 is produced in germinaton.—A new trypanosome in birds: M. Thiroux. —Some phenomena during ovogenesis among the cirripedes, particularly in Scalpellum velutinum: A. Gruvel.— On the structure of the heart in gasteropods and lamellibranchs: F. Marceau,—On the development of black rot (Guignardia Bidwellii): P. Viala and P. Pacottet. For rapid development black rot requires a warm temperature and a moist atmosphere, but at low temperatures growth proceeds slowly. It is, moreover, highly resistant towards acids and toxic substances generally.—Garéwaite, a new fibrous basic rock of the North Urals: L. Duparc and F. Pearce.—Stationary waves observed in the neighbourhood of the human body: Augustin Charpentier.—Localisation of iodine in the African turtle: MM. Doyon and Chenu.—Action of salts of the alkaline earths on living substance: N. C. Paulesco.—Influence of sterilisation on food-stuffs: A. Charrin.—On the contractility of protoplasm, i., action of chlorhydrate of amyleine on ciliary movement: L. Launoy.—On the supposed chlorophyll of silk: Jules Villard.