Papers read to the Society, January 18, 1900.

I. “Upon the Development of the Enamel in certain Osseous Fish." By C. S. Tomes, F. R. S. II. “Further Observations on ‘Nitragin’ and on the Nature and Functions of the Nodules of Leguminous Plants.” By Miss M. Dawson. Communicated by Professor Marshall Ward, F. R. S. III. “On the Innervation of Antagonistic Muscles. Sixth Note.” By Professor Sherrington, F. R. S. IV. “On the Viscosity of Argon as affected by Temperature.” By Lord Rayleigh, F. R. S. V. “On the Behaviour of the Becquerel and Röntgen Rays in a Magnetic Field.” By the Hon. R. J. Strutt. Communicated by Lord Rayleigh, F. R. S. VI. “On an Experimental Investigation of the Thermo-dynamical Properties of Superheated Steam.” By J. H. Grindley. Communicated by Professor Osborne Reynolds, F. R. S.