PROCEEDINGS 



or 



THE EOYAL SOCIETY. 



January 17, 1901. 



Sir WILLIAM HUGGINS, K.C.B., D.C.L., President, in the Chair. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : — 



I, " Total Eclipse of the Sun, January 22nd, 1898. Observations at 

 Viziadrug. — Part IY. The Prismatic Cameras." By Sir 

 Norman Lockyer, K.C.B., F.E.S. 



II. "Wave-length Determinations and General Results obtained from 

 a Detailed Examination of Spectra photographed at the Solar 

 Eclipse of January 22, 1898." By J. Evershed. Communi- 

 cated by Dr. Eambaut, F.E.S. 



III. " The Thermo-chemistry of the Alloys of Copper and Zinc." By 

 T. J. Baker. Communicated by Professor Poynting, F.E.S. 



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

 the Principle of Homotyposis and its Relation to Heredity, to 

 the Variability 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. Eeceived October 6, — Eead November 15, 1900. 



(Abstract.) 



(1.) If we take two offspring from the same parental pair, we find a 

 certain diversity and a certain degree of resemblance. In the theory 

 VOL. LXVIII. B 



