Philosophical Transactions of the Royal Society (1701-)

X. An Experimental Determination of the Values of the Velocities of Normal Propagation of Plane Waves in different directions in a Biaxial original: "Biaxal" Crystal, and a Comparison of the Results with Theory. By R. T. GLAZEBROOK, B.A., Fellow of Trinity College, Cambridge. Communicated by J. CLERK MAXWELL, M.A., F.R.S. . . . . . . . . . . . . . . . . . . . . . . . . . page 287

XI. On certain Definite Integrals occurring in Spherical Harmonic Analysis A mathematical method used to represent functions on the surface of a sphere, often used in studying gravity, electricity, and magnetism. and on the Expansion, in Series, of the Potentials of the Ellipsoid and the Ellipse. By W. D. NIVEN, M.A., Fellow of Trinity College, Cambridge. Communicated by J. W. L. GLAISHER, M.A., F.R.S. . . . . . . . . . . . . . . . . . 379

XII. Measurements of Electrical Constants.—No. II. On the Specific Inductive Capacities Now more commonly known as "relative permittivity," this refers to a material's ability to store electrical energy in an electric field. of Certain Dielectrics Insulating materials that do not conduct electricity but can sustain an electric field.—Part I. By J. E. H. GORDON, B.A. of Cambridge original: "Cantab," an abbreviation for Cantabrigiensis, indicating a degree from the University of Cambridge., Assistant Secretary of the British Association. Communicated by Professor J. CLERK MAXWELL, F.R.S. . . . . . . . . . . . . . . . . . . 417