Abstract
ROME. Royal National Academy of the Lincei, June 1.—F. Severi: The whole of the singular points of an analytical function of several variables.—Guido Fubini: Further with regard to the canonical cluster.—Q. Majorana: Optical telephony by means of ultra-violet or infra-red rays. Improved results have now been obtained as a result of modification of the arrangement of the apparatus. By means of filtered infra-red light from a 500-watt incandescent lamp, telephonic communication has been established between stations ten kilometres apart, excellent reproduction of the words being obtained.—L. Lombardi and Paolo Lombardi: Behaviour of the moving-coil transformer in constant current circuits.—A. Angeli: The constitution and reactions of the diazo-hydrates. Hantzsch's views on the structure of the diazo-hydrates are refuted, Swietoslawski's thermochemical data being quoted in support of the structures advanced by the author.—G. Tizzoni and G. De Angelis: Immunity against cancer conferred on animals by phenolate auto-vaccine. The results of numerous experiments on white mice show that immunity against Ehrlich's adenocarcinoma may be attained by the use of phenol, which converts the cancerous matter into vaccine. The phenol is administered in 0.5 per cent solution for a period of 24–72 hours, the immunity appearing 11 days later and persisting for more than 4 months.—Giuseppe Levi: A differentiation of nerve cells.—G. Levi and G. C. Dogliotti: The structure of adipose cells. The adipose cells of the adult rat exhibit a very thin cytoplasmic film containing a large number of chondriosomes in the form of granules and short rods, the view that adipose cells are composed of an adipose drop contained in a reticular envelope being hence inadequate.—M. Kourensky: Riccati's equation.—Pia Nalli: A generalised displacement in Riemannian spaces.—U. Cassina: The conception of vectors.—B. Segre: Continuous systems of plane curves with tacnode.—E. Čech: A characteristic property of Fubini's surfaces.—L. S. Da Rios: Wings and helices.—E. Fermi: The motion of a body of variable mass.—G. Viola: Pendular oscillations in the elliptic elements of the variable W Ursæ majoris.—M. Pierucci: Concerning recent experiments on thin metallic films. Results lately obtained support the view that conductors electrically charged undergo a variation in resistance.—D. Graffi: Demonstration of the formula of retarded potentials by the method of functional operators.—F. Neri: The auto-excitation of auto- compensated asynchronous machines.—Remo de Fazi: Syntheses in organic chemistry by means of radiant energy (3). Acenaphthene and benzaldehyde. A benzene solution of benzaldehyde and acenaphthene, exposed in a sealed glass tube to sunlight for two years, yielded a trimeride and a tetrameride of benzaldehyde, stilbene, isostilbene, a resinous substance, and a compound formed by the condensation of one molecule of acenaphthene and one molecule of benzaldehyde with loss of one molecule of hydrogen.—O. Scarpa: Concentration, wholly metallic piles acting at variance with Voltas law. Measurements at constant temperature (18°) of the electromotive force of the cells, platinum-zinc amalgam-mercuryplatinum, and platinum-cadmium amalgam-mercuryplatinum, give values which vary linearly with the concentration of the amalgam in the case of zinc and almost linearly in that of cadmium within the limits of composition for which the amalgams exist as monophase liquid systems.—G. A. Barbieri: Ferrocyanomolybdates and analogous compounds of ruthenium and osmium. When introduced into ammonium acetate solution, the reddish-brown, gelatinous precipitate obtained by the interaction of a molybdate and a ferrocyanide in acid solution is transformed into a canary-yellow, crystalline compound, (NH4)4Fe(CN)6, 2MoO3, 3H2O. The ready conversion of this into the silver compound, Ag4Fe(CN)6, 2MoO3, H2O, points to the existence of the complex [Fe(CN)6, 2MoO3], the structure of the ammonium compound being probably [MoO3(CN)3Fe(CN)3MoO3](NH4)4. The corresponding ruthenocyanomolybdate and osmiocyanomolybdate have analogous formulæ.—G. R. Levi and A. Baroni: Diethyl triselenide, sulphodiselenide, and selenodisulphide. Diethyl triselenide, (C2H5)2Se3, is obtained by the action of selenium oxychioride on selenomercaptan or by that of selenium on diethyl diselenide; diethyl sulphodiselenide, (C2H5)2Se2S, by the action of mercaptan on selenium chloride or oxychloride, or that of selenium on diethyl disulphide, and diethyl selenodisulphide, (C2H5)2SeS2, from either selenomercaptan and thionyl chloride or sulphur and the diselenide. The progressive replacement of the sulphur of these compounds by selenium is accompanied by marked increases in the densities and refractive indices. —L. Dc Caro: Molecular weight of myoprotein, determined by Du Noüy's surface tension method. Determinations of the surface tension of the myoprotein of the dog dissolved in water in presence of a trace of sodium hydroxide show that the static surface tension, before reaching the corresponding dynamic value, exhibits three characteristic minima at the dilutions 1: 37000, 1: 55000, and 1: 80000. On the assumption that these minima correspond with the formation of monomolecular layers of different orientations, the dimensions of the molecular parallelepiped are calculated to be 225.6, 151.7, and 104.3 A. respectively. The volume of the molecule is thus 3569513 × 10-24 c.c., its mass 2644084 × 10-24 gm., and the molecular weight 1602843, but other considerations indicate that the last figure is too high for anhydrous myoprotein. Approximately, however, the proportion of myoprotein in muscle suffices to cover the total surface of the myofibrils with a monomolecular layer.—G. Quagliariello: Sodium, potassium, calcium, and magnesium in muscular fluid and in its ultra-filtrate. Examination of the muscular fluid of the dog shows that the whole of the sodium in the fluid, together with about two-thirds of the potassium and three-fifths of the calcium and magnesium pass through a collodion ultra-filter.—L. Maddalena: Geological results of the boring of the tunnel of the direct Bologna-Florence line through the Tuscan-Bolognese Appenines.—G. Martino: Behaviour of the phosphogens in muscular tetanus.—M. Tirelli: Tropism phenomena in the larva of Bombyx mon.
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Societies and Academies. Nature 124, 638–639 (1929). https://doi.org/10.1038/124638a0
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DOI: https://doi.org/10.1038/124638a0