[ iv ] 
IX. Experimental Investigations on the Effective Temjperature of the Sun, made at 
Daramona, Streete, Co. Westmeath. By William E. Wilson, M.R.I.A., and 
P. L. Gray, B.Sc., A.R.C.S., Lecturer in Physics, Mason College, Birming¬ 
ham. Communicated hy G. Johnstone Stoney, F.R.S .pa-g’® 361 
Index to Part I. . 396a 
X. Bakerian Lecture .—On the Relations between the Viscosity {Internal Friction) 
of Liquids and their Chemical Nature. By T. E. Thorpe, F.R.S., and J. W. 
Kodger, Assoc. R.C.S .397 
XL Preliminary Report on the Results obtained with the Prismatic Cameras during 
the Total Eclipse of the Sun, April 16, 1893. By J. Norman Lockyer, C.B., 
F.R.S .711 
XII. A Dynamical Theory of the Electric and Luminiferous Medium. By Joseph 
LARMOR, F.R.S., Fellow of St. John’s College, Cambridge .719 
XIII. On the Refection and Refraction of Light. By G. A. Schott, B.A. {Camb.), 
B.Sc. {Bond.), formerly Scholar of Trinity College, Cambridge. Communi¬ 
cated by K T. Glazebrook, M.A., F.R.S. .823 
XIV. A n histrument for Grinding Section-plates and Prisms of Crystcds of Artificial 
Preparations Accurately in the Desired Directions. By A. E. Tutton, Assoc. 
R.C.S., Demonstrator of Chemistry at the Royal College of Science, South 
Kensington. Communicated by Professor Thorpe, F.R.S. .887 
XV. A 71 Instrument of Precision for Producing Monochromatic Light of any desired 
Wave-length, and its use in the Investigation of the Optical Properties of 
Crystals. By A. T. Tutton, Assoc. R.C.S., Demonstrator of Chemistry at 
the Royal College of Science, South Kensington. Communicated by Professor 
Thorpe, F.R.S. .913 
XVI. On the Specific Heats of Gases at Constant Volume .— Part II. Carbon Dioxide. 
By J. JoLY, M.A., Sc.D., F.R.S. .943 
XVII. On the Sptecific Heats of Gases at Constant Volume. — Part III. The Specific 
Heat of Carbon Dioxide as a Function of Temperature. By J. Joly, M.A., 
Sc.D., F.R.S. . 961 
