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39. , and LiNDER, P. J., Unpublished data. 



40. , and Marth, P. C, Botan. Gaz., 106:199 (1944). 



41. , and Martin, W. E., ibid., 99:171 (1937). 



42. , and Stuart, N. W., ibid., 100:627 (1939). 



43. , and Whitehead, Muriel R., ibid., 102:393 (1940). 



44. , WiRWiLLE, J. W., and Weil, L., Science, 110:252 (1949). 



45. OvERBEEK, J. VAN, Am. J. Botany, 31:256 (1944). 



46. Rasmussen, L. W., Plant PhysoL, 22:377 (^947)- 



47. Rhodes, A., and Templeman, W. G., Nature, 160:825 (1947). 



48. Rice, E. L., Botan. Gaz., 109:301 (1948). 



49. Sell, H. M., Lucke, R. W., Taylor, B. M., and Hamner, C. L., Plant 



PhysoL, 24:295 (1949). 



50. Smith, F. G., ibid., 23:70 (1948). 



51. , Hamner, C. L,, and Carlson, R. P., ibid., 22:58 (1947). 



52. Smith, O., Nash, L. B., and Davis, G. E., Botan. Gaz., 102:206 (1940). 



53. SouTHWicK, F. W., Proc. Amer. Soc. Hort. Sci., 47:84 (1946). 



54. Staniforth, D. W., and Loomis, W. E., Science, 109:628 (1949). 



55. Stuart, N. W., Botan. Gaz., 100:298 (1938). 



56. TuKEY, H. B., Hamner, C. L., and Imhofe, Barbara, /<5'/^., 107:62 (1945). 



57. Weaver, R. J., ibid., 110:300 (1948). 



58. , and De Rose, R, H., ibid., 107:509 (1946). 



59. , ibid., 107:509 (1946). 



60. Weaver, R. J., Minark, C. E., and Boyd, F, T., ibid., 107:540 (1946). 



61. Went, F. W., and Thimann, K. V., Phytohormones (Macmillan, 1937). 



62. Wood, J. W., Mitchell, J. W., and Irving, G. W., Jr., Science, 105:33 



(1947)- 



63. , ibtd., 105:337 (1947). 



64. Zimmerman, P. W., and Hitchcock, A. E., Contrib. Boyce Thompson 



Inst., 12:321 (1942). 



