Argon and its Companions. 329 



in course of publication, in accordance with the Standing Orders of 

 Council, were read in title : 



" South African Horse-sickness : its Pathology and Methods of Protec- 

 tive Inoculation." By ALEXANDER EDINGTON, M.B., C.M., 

 F.RS.E., Director of the Colonial Bacteriological Institute, Cape 

 Colony. Communicated by Sir DAVID GILL, F.E.S. 



" Note on the Occurrence of a Seed-like Fructification in certain 

 Palaeozoic Lycopods." By D. H. SCOTT, M.A., Ph.D., F.R.S., 

 Honorary Keeper of the Jodrell Laboratory, Eoyal Gardens, Kew. 



" The Demarcation Current of Mammalian Nerve. (Preliminary 

 Communication.) Parts I III." By J. S. MACDONALD, B.A., 

 L.RC.P.E. Communicated by Professor SHERRINGTON, F.R.S. 



The following Papers were read : 



I. "Argon and its Companions." By Professor W. RAMSAY, F.R.S., 

 and Dr. M. W. TRAVERS. 



II. " Data for the Problem of Evolution in Man. VI. A First Study 

 ' of the Correlation of the Human Skull." By Dr. ALICE LEE 

 and Professor K. PEARSON, F.R.S. 



III. " 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 Race. 

 Part I. Homotyposis in the Vegetable Kingdom." By Pro- 

 fessor K. PEARSON, F.R.S. 



IV. " A Chemical Study of the Phosphoric Acid and Potash Contents 



of the Wheat Soils of Broadbalk Field, Rothamsted." By 

 Dr. BERNARD DYER. Communicated by Sir J. H. GILBERT, 

 F.R.S. 



"Argon and its Companions." By WILLIAM RAMSAY, F.R.S., 

 and MORRIS W. TRAVERS, D.Sc. Received November 13, 

 Read November 15, 1900. 



(Abstract.) 



The discovery of krypton and neon was announced to the Royal 

 Society in the early summer of 1898 ; and subsequently atmospheric 

 air was found to contain a heavier gas to which the name of xenon was 

 applied. Mr. Baly, in the autumn of the same year, called attention to 

 the presence of helium lines in the spectrum of neon, an observation 



