I 8 MEYER 



Andrew Denny Rodgers III, a unique figure on the American literary scene. 

 His biographies of well-known botanists and histories of phases of the 

 development of botanical science are readable, scholarly, and authentic. 



Jacques Rousseau, whose explorations of the unknown North have provided 

 an important contribution to Pleistocene biogeography. His sympathetic 

 interest in Indian and Eskimo folklore and ways of life and his encyclo- 

 pedic knowledge of the history of Canadian exploration have yielded a 

 rich harvest of ethnobotanical studies. 



Karl Sax, for his classical studies on the chromosomes of wheat, his con- 

 tinued interest in the chromosomes of the ornamental woody plants, and 

 his extensive contributions about the effect of irradiation on chromosome 

 breakage and chromosome structure. 



Paul Bigelow Sears, whose pioneering efforts in pollen analysis and con- 

 tinued interest in geochronological problems have made him the leader 

 of all in this field, on our continent. The keenness of his mind, the 

 warmth of his personality, the quality of his writing, and his capacity 

 to relate all scientific problems to man have earned for him the distinc- 

 tion of an exemplary figure in American science. 



Homer Leroy Shantz, plant physiologist, plant ecologist, and administrator 

 of note. His contributions to the understanding of drought resistance in 

 plants, to the ecology of grasslands, and to world-wide plant geography 

 have been laudable achievements in botanical science. 



Edmund Ware Sinnott, morphologist, anatomist, geneticist, and botanical 

 statesman, for his numerous, varied, and sustained contributions to plant 

 anatomy, histology, evolution, and botanical theory. 



FoLKE Karl Skoog, for outstanding contributions to knowledge in various 

 subdivisions of plant physiology, especially tissue culture, hormonal regu- 

 lation of plant growth, and algal physiology. 



Gilbert Morgan Smith, morphologist, for his numerous contributions to 

 cryptogamic botany, and in particular for his study of life histories of 

 marine and fresh-water algae. 



Elvin Charles Stakman, for his illustrious international leadership in sci- 

 ence, for his recognized world leadership in researches on the pathogens 

 of cereal smuts and rusts, and for his genius in inspiring students and 

 workers to labor untiringly to provide food for mankind. 



George Ledyard Stebbins, for his specific contributions to the cytogenetics 

 of parthenogenesis, hybridization, and polyploidy, particularly in Gua- 

 yu\e, Kok-saghyz, and the forage grasses, and for his outstanding review 

 of the whole problem of evolution in plants. 



John Albert Stevenson, whose encyclopedic knowledge of the fungi of the 

 world and the diseases they induce has with generosity and humility 

 been placed at the service of a generation of botanists. 



