Volume 43 



December 1943 



TORREYA 



NEW 

 Number 2B0Ti< 



QAi 



EDITED FOR 



THE TORREY BOTANICAL CLUB 



BY 



HAROLD H. CLUM 



CONTENTS 



THE SEVENTY-FIFTH ANNIVERSARY CELEBRATION OF THE TORREY 

 BOTANICAL CLUB, JUNE 22-27, 1942 



Viruses in Relation to the Growth of Plants L. O. Kunkel 87 



Animal Hormones AflEecting Growth and the Several Effects of 



Single Hormones Oscar Riddle 96 



The Formative Influences and Comparative Effectiveness of 



Various Plant Hormone-like Compounds P. W. Zimmerman 98 



Plants Need Vitamins Too William J. RoBsms 116 



Genetics, the Unifying Science in Biology George H. Shull 126 



Criteria for the Indication of Center of Origin in Plant 



Geographical Studies Stanley A. Cain 132 



Phytopathology— 1867-1942 George M. Reed 155 



The Field Trip to the New Jersey Coast and Pine Barrens, 



Friday and Saturday, June 26-27, 1942 E. J. Alexander and H. K. Svenson 170 



Activities of the Club, May to November 1943 174 



Additions to the List of Botanists in the Frontispiece 178 



Index to Torreya, Volume 43 179 



Published for the Club 



By the Free Press Printing Company 

 187 College Street, Burlington, Vermont 



Entered as second class matter at the post office at Burlington, Vermont, 

 October 14, 1939, under the Act of March 3, 1879 



