Papers read to the Society, February 20, 1902

I. “Further Observations on Nova Persei.” By Sir Norman Lockyer K.C.B., F. R. S. II. “Some Physical Properties of Nitric Acid Solutions.” By V. H. Veley, F. R. S., and J. J. Manley. III. “The Anatomy of Symmetrical Double Monstrosities in the Trout.” By Dr. J. F. Gemmill. Communicated by Professor Cleland, F. R. S. IV. “Preliminary Communication on the Œstrous Cycle and the Formation of the Corpus Luteum in the Sheep.” By F. H. A. Marshall. Communicated by Professor J. C. Ewart. F. R. S. V. “On the Composition and Variations of the Pelvic Plexus in Acantliiasvulgaris.” By R. C. P unnett. Communicated by Dr. Gadow, F. R. S. VI. “On the Heat dissipated by a Platinum Surface at High Temperatures. IV .- High-Pressure Gases.” By J. E. Petavel. Communicated by Professor Schuster, F. R. S.