CONTENTS. 



VOL. LXVIII. 



oo^oo 



No. 442. 



Page 



Meeting of January 17, 1901, and Proceedings.... 1 



Mathematical Contributions to the Theory of Evolution. IX. — On the 

 Principle of Homotyposis and its Eelation to Heredity, to the Vari- 

 ability of the Individual, and to that of the Eace. Part I. — 

 Homotyposis in the Vegetable Kingdom. By Karl Pearson, F.E.S., 

 with the assistance of Alice Lee, D.Sc., Ernest Warren, D.Sc, Agnes 

 Fry, Cicely D. Fawcett, B.Sc, and others 1 



Total Eclipse of the Sun, January 22, 1898. Observations at Vizia- 

 drug. Part IV. — The Prismatic Cameras. By Sir Norman Lockyer, 

 K.C.B., F.E.S 6 



Wave-length Determinations and General Eesults obtained from a 

 Detailed Examination of Spectra photographed at the Solar Eclipse 

 of January 22, 1898. By J. Evershed. Communicated by Dr. 

 Eambaut, F.E.S 6 



The Thermo- Chemistrj' of the Alloys of Copper and Zinc. By T. J. 

 Baker, B.Sc, King Edward's School Birmingham. Communicated 

 by Professor Poynting, F.E.S , 9 



A Chemical Study of the Phosphoric Acid and Potash Contents of the 

 Wheat Soils of Broadbalk Field, Eothamsted. By Bernard Dyer, 

 D.Sc, F.I.C. Communicated by Sir J. Henry Gilbert, F.E.S 11 



Meeting of February 7, 1901, and Proceedings 14 



List of Papers read 15 



Further Investigations on the Abnormal Outgrowths or Intumescences 

 in Hibiscus vitifolius, Linn. : a Study in Experimental Plant 

 Pathology. By Elizabeth Dale. Communicated by Professor H. 

 Marshall Ward, F.E.S 16 



The Integration of the Equations of Propagation of Electric Waves. 

 By A. E. H. Love, F.E.S „ 19 



On the Proteid Eeaction of Adamkiewicz, with Contributions to the 

 Chemistry of Glyoxylic Acid. By F.'Gowland Hopkins, M.A., 

 M.B., University Lecturer in Chemical Physiology, and Sydney W. 

 Cole, B.A., Trinity College. (From the Physiological Laboratories, 

 Cambridge.) Communicated by Dr. Langley, F.E.S..... 21 



