298 PLANT GROWTH SUBSTANCES 



37. , ibid., 26:109 (1939a). 



38. , Botan. Gaz., 104:460 (1943). 



39. , and Bonner, D. M., Arch. Biochem., 1:439 (1943). 



40. , and Thimann, K. V., Phytohortnones (New York, 1937). 



41. DE WiNTON, D. and Haldane, J. B. S., /. Genetics, 27:1 (1933). 



42. WiTHROw, A. P. and Withrow, R. B., Botan. Gaz., 104:409 (1943). 



43. Zimmerman, P. W., Torreya, 43:98 (1943). 



