Papers read to the Society, February 7, 1901.

I. “Some Additional Notes on the Orientation of Greek Temples, being the Result of a Journey to Greece and Sicily, in April and May, 1900.” By F. C. Penrose, F. R. S. II. “The Transmission of theTrypanosoma Evansi by Horse Flies, and other Experiments pointing to the Probable Identity of Surra of India and Nagana or Tsetse-fly Disease of Africa.” By Dr. Leonard Rogers. Communicated by Major D. Bruce, R.A.M.C., F. R. S. III. “On the Influence of Ozone on the Vitality of some Pathogenic and other Bacteria.” By Dr. A. Ransome, F. R. S., and A. G. R. Foulerton. IV. “On the Functions of the Bile as a Solvent.” By B. Moore and W. H. Parker. Communicated by Professor Schäfer, F. R. S. V. “On the Application of the Kinetic Theory of Gases to the Electric, Magnetic, and Optical Properties of Diatomic Gases.” By G. W. Walker. Communicated by Professor Rücker, Sec. R. S. VI. “Heredity, Differentiation, and other Conceptions of Biology: A Consideration of Professor Karl Pearson’s Paper ‘On the Principle of Homotyposis.’ ” By W. Bateson, F. R. S.