Plant Qrowth'Suhstances 



Grace, N. H. (1937)- Canadian Journ. Res., Sect. C, 15, 538; 



(1938 fl), Nature, 141, 35; (19386), Canadian Journ. 



Res., Sec. C, 16, 313-329. An account of the last paper 



is given by Hugh Nicol, Manuf. Chem., 1938, 9, 388. 

 McRostie, G. P., Hopkins, J. W., and Grace, N. H. (1938). 



Canadian Journ. Res., Sect. C, 16, 510. 

 Tovarnitzky, V. I., and Statkovskaia, E. I. (1938), Khim. 



Sotsial. Zemled. (Chemisation of Socialistic Agriculture), 



Part 3, 37-45. 



50 



