SCIENCE 



FRroAY, Februaky 11, 1921 



CONTENTS 



Dinner in Honor of Br. Keen: Da. John H. 

 JOPSON 123 



Address : Dr. W. W. Keen ] 24 



The Belation of Mendelism and the Mutation 

 Theory to Natural Selection: Professor 

 C. C. Nutting ] 29 



Scientific Events: — 

 Frofessor Calmette on a Vaccine for Tuber- 

 culosis; Awards of the Paris Academy of 

 Sciences; The University of London's 

 Physiological Laboratory ; Popular Lectures 

 on Scientifio Subjects at the California 

 Academy of Sciences 131 



Scientific Notes and News ] 34 



University and Educational News 137 



Discussion and Correspondence: — 



Thrice-told Tales: Dr. T. C. Mendenhall, 

 Dr. Jonathan Wright. Seply to Professor 

 Horn: Professor Plorian Cajori. A Cor- 

 rection: Dr. David Wilbur Horn. Memoir 

 of G. K. Gilbert: Professor W. M. Davis. 137 



The Printing of Astronomical Observations. 140 



Special Articles: — 



On the Stability of the Acid-base Equi- 

 librium, of the Blood in Normal and in 

 Naturally Nephropathic Animals: Pro- 

 KESSOE William B. McNider 141 



The American Chemical Society: Dr. Charles 

 L. Parsons 143 



MSS. intended for publication and books, etc., intended for 

 review ahould be sent to The Editor of Science, Garriaon-on- 

 Hudson, N. Y. 



DINNER IN HONOR OF DR. KEEN 

 On January 20, 1921, a dinner was tendered 

 to Dr. William Williams Keen, the eminent 

 Philadelphia surgeon, at the Bellevue Strat- 

 ford Hotel, in Philadelphia, in celebration of 

 his eighty-fourth birthday. Dr. Keen had 

 recently returned from Europe, v?hither he 

 had gone in the summer of 1920, to preside at 

 the meeting in Paris, of the Societe Inter- 

 nationale de Chirurgie, of which he had been 

 elected president in 1914, and the meetings of 

 which had been of necessity suspended during 

 the war. Everywhere abroad he had been re- 

 ceived with honors befitting his position as 

 President of this Society, and as the leader 

 and dean of Am.erican surgery. It was 

 thought an appropriate time for the friends 

 and admirers of Dr. Keen in this country, to 

 show their appreciation of his many achieve- 

 ments as physician, scientist, educator, man 

 of letters, and patriotic American. The 

 occasion proved to be one of the most re- 

 markable tributes ever tendered a private 

 citizen in Philadelphia. Between five and sis 

 hundred subscribers, representing all parts of 

 the country, and all of the learned professions, 

 and the fields of diplomacy, industry, finance, 

 and the public services, joined in honoring 

 Dr. Keen. 



The presiding officer and toastmaster was 

 his close friend and colleag-ue. Dr. George E. 

 deSchweinitz, professor of ophthalmology in 

 the University of Pennsylvania, and like Dr. 

 Keen, a former president of the College of 

 Physicians of Philadelphia, the premier med- 

 ical society of the United States. The speak- 

 ers, who dwelt on various phases of the activi- 

 ties of Dr. Keen's long and busy life, had all 

 been closely associated with him in one or 

 more of these fields of work. The list in- 

 eluded the following gentlemen: Dr. J. Chal- 

 mers DaCosta, his one-time assistant, now 

 Gross professor of surgery, in the Jeffer- 



