[ X ] 
X. An Experimental Determination of the Values of the Velocities of Normal Pro¬ 
pagation of Plane Waves in different directions in a 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 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 of Certain Dielectrics .-—Part I. By J. E. H. Gordon, B.A. Cantab, 
Assistant Secretary of the British Association. Communicated by Professor 
J. Clerk Maxwell, F.R.S .417 
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