General and physical chemistry

1912 Journal of the Chemical Society Abstracts  
Refraction and Magnetic Rotation of Mixtures. FREDERIC SCHWERS (Compt. re?zcl., 1'3 12, 155,398-400).-1n connexion with the results recorded by Muller and Guerdjikoff (this vol., ii, 325) i t is pointed out that since magnetic rotntion and refractive index are both dependent on co-volume, i t is unlikely that one should be a linear function of concentration, whilst the other should show a " break " in the curve at a definite concentration (compare Abstr., 1910(compare Abstr., , ii, 913, 1039
more » ... , ii, 913, 1039 191 1, ii, 92, 949). Further, the figures found for the refractive indices of (1) aniline, and ( 2) some of the alcohol-aniline mixtures, do not agree with the fairly concordant figures recorded by previous workers. T. A. H. The Refractive Indices of Solutions of the Cadmium Haloids. FHEDERICK H. GETMAN aud HELEN T. GILROY (Amer. Chem. J., 19 12, 48, 138--145).-The molecular refractivities of aqueous solutions of cadmium chloride, bromide, and iodide, varying in concentration from approximately 1% t o 40%. are nearly constant over the entire range of concentrations. Using the values of the atomic refrnctivities of the halogens given by Bitxter (Abstr., 1911, ii, 557), the atomic refractivity of cadmium i3 calculated t o be 5 30, 5.52, and 5.05 in the solutions of the chloride, bromide, and iodide respectively, Dispersion of C i n n a b a r . HERNANN ROSE (Centr. Min., 19 12, 527--531).--The refractive indices of cinnabar have been determined for light of different wave-lengths with R prism cut from a crystal Variation of the Abiotic Power of the Ultrs-violet Rays with their Wave-length. MME. VICTOR HEKRI and VICTOR HENRI (Compt. rend. , 1912, 155, 315-318).-A study of the abiotic power of ultra-violet rays below h = 30OOp. The sources used for the rays were ( I ) a condensed spark from ningnesium ; (2) a mercury arc in quartz ; (3) a condensed spark from cadmium. Screens were employed to arrest certain portions of the ultra-violet spectrum. A table is given showing the ultra-violet rays from the three sources employed, and the amount of energy transmitted by the following screens : viscose, 0.06 mm. ; a glass plate, 0.14 mu].; cellulose acetate, 0.05 mm.; a solution of acetone (5?;), 5.0 mm. ; and (10%) 5.0 mm., and a glass plate, 0.7 m u . in thickness. The last column in the table gives the coefficient of extinction by egg-white as a type of protoplasm. The results show t h a t the abiotic power of the ultra-violet rays increases continuously as t h e wave-length diminishes, and that it is proportional t o the coefficient of absorption by protoplasm. W. G. Ultra-red Emission Spectra. HANS LEIIMANN ( A ? m Physik, 1912, [iv], 39, 53-79).-The extiriction of phosphorescence by ultra-red VOL. (211. 11. 58 giving a mean value of 5.29.
doi:10.1039/ca9120205873 fatcat:jwytko36svglldjy7tppfbp5hi