Plant Qroivth'Suhstances 



24, 135; see also Solacolu, T., and Constantinesco, D., 

 Compt. rend., (1936), 203, 437. 



Macht, David I., and Grumbein, Mary L. (1937), Amer, 

 Journ. Bot., 24, 457. 



Marmer, Dina R. (1937), Amer. Journ. Bot., 24, 139. 



Nicol, Hugh (1937), Animal hormones and plant growth. 

 Chetn. and Ind., 56, 23. 



Overbeek, J. Van (1938), Bot. Gaz., 100, 133. 



Pearse, H. L. (1938). Annals Bot. N.S., 2, 227. 



Shackell, Ethel M. (1937), Austral. Journ. Exper. Biol., 15, 33. 



Snow, R. (1937), Nature, 139, 27. 



Thimann, K. W. (1935), Verslag. K. Akad. Wet., Amster- 

 dam, 38, 896, 



Thimann, K. W. (1938). Plant Physiol, 13, 437. 



Thimann, K. W., and Skoog, Folke (1933). Proc. Nat. Acad. 

 Sci., 19, 714. 



"Went, F. W. {1938). Specific factors other than auxin affect- 

 ing growth and root development. Plant Physiol., 13, 55. 



90 



