Wiedemantis Annalen der Physik, January.—Double refraction in glass plates vibrating transversely, by W. Konig. In a long glass plate or rod vibrating transversely, there is at the nodes double refraction of a peculiar kind. This has been subjected to a detailed experimental study, and the results discussed fully from the theoretical point of view. The author has been successful in obtaining photographic records of these phenomena, copies of which accompany the paper.—On the tones produced by vibrating sheets of gas in flames, by V. Henson. A photographic study of vibrating flames.—On the absorption of light in coloured glass, by R. Zgismondy. The colour of a glass, and hence its absorption spectrum, depends, not only upon the nature of the colouring material present, but also upon the composition of the colourless glass itself. Experiments were therefore carried out with twelve glasses of different composition, varying from pure sodium and potassium silicate on the one hand to pure lead silicate on the other. Borax and fused boron trioxide were also examined. The colouring oxides included the oxides of copper, chromium, cobalt, nickel, manganese, iron and uranium. For these glasses the constant A = E/gS was determined, where S is the specific gravity of the glass, g the number of milligrams of the colouring oxide per gram of glass, and E the extinction coefficient. The results are expressed graphically.—On the decrement of the electrical vibrations on the charging of condensers, by A. F. Sundell and Hj. Tallqvist. Although in many researches on damped vibrations the experimental figures for the time of oscillation agree well with those deduced theoretically, in the case of the decrement of these vibrations the agreement is either very rough, or there is no agreement at all. In the present series of experiments it is shown that if the necessary corrections are introduced, the experimental and theoretical results agree exactly.—On the melting point of gold, by L. Holborn and A. Day (see p. 330).—On the expansion of some metals at high temperatures, by L. Holborn and A. Day. The coefficients of expansion of platinum, palladium, silver, 20 per cent, platinum-iridium nickel, constantin, wrought iron and steel were determined for temperatures between 0° and 1000°C, where the melting-points allowed.—On the irregularity of the Weston cadmium element with 143 per cent, amalgam in the neighbourhood of 0° C, by W. Jaeger. It is shown that in the neighbourhood of 0° C. the irregular variations of this cell may amount to as much as two millivolts, although at 10° C. different elements agree to within a few tenths of a millivolt.—Communication to the knowledge of the phenomena in induction apparatus, by K. K. Johnson.—On surface tension, by H. Hulshof. The necessary existence of surface tension is deduced from the assumption of a continuous density variation in the capillary layer.—On the numerical relation between the two elasticity constants in isotropic media, according to the molecular theory, by W. Voigt.—On the electrical analogue to the Zeeman effect, by W. Voigt.—On the change of the form of vibration of light when propagated through a dispersive and absorbing medium, by W. Voigt.—Calculation of the conductivity of gases, by J. Stark.—A criticism of the mode of derivation of Wien's spectrum equation, by E. Jahnke, O. Lummerand E. Pringsheim.—On the history of telegraphy, by L. Lewin.