AWARDS OF CERTIFICATES OF MERIT 1 9 



Kenneth Vivian Thimann, for his extensive and preeminent contributions 

 to the biochemical physiology of green and nongreen plants and to the 

 physiology of plant growth. 



Edgar Nelson Transeau, for his lifetime of support and encouragement of 

 botanical science in its broadest sense, both in its educational and scien- 

 tific aspects. He has made substantial contributions to plant ecology, 

 algology, and to botanical education at all levels, from high school to 

 graduate school. 



CoRNELis Bernardus Van Niel, whose studies in the realm where kingdoms 

 and classes scarcely exist have provided illumination for syntheses of di- 

 verse phases of biology. 



John Ernst Weaver, for his lifetime of researches on the ecology of grass- 

 lands. His investigations have contributed to the understanding of the 

 dynamics of vegetation and have helped provide a necessary background 

 for new policies in range management. 



Frits Warmolt Went, for his breadth of constructive interest in botanical 

 science and especially for his contributions in the fields of plant physiology 

 and ecology. The first botanist to put the assay of auxins on a quantita- 

 tive basis, he subsequently has added substantially to our knowledge of 

 the hormonal relations of plants. He has also been an outstanding in- 

 vestigator of the growth of plants under controlled environmental con- 

 ditions. 



Ralph Hartley Wetmore, plant anatomist and student of morphogenesis, 

 for his numerous investigations of the developmental anatomy of vascular 

 plants and for his studies on morphogenesis of vascular cryptogams. 



Truman George Yuncker, for his lifetime of effective teaching at the under- 

 graduate level, which has resulted in launching many able young scholars 

 into careers in botany, and for effective contributions in taxonomy, espe- 

 cially of the Piperaceae. 



