400 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1941 



Van deb Lek, H. A. A. 



1925. Over de wortelvorming van houtige stekken. (With a summary in 

 English.) 230 pp. Wageningen. 

 Went, F. W. 



1928. Wuchsstoff und Wachstum. Rec. Trav. Bot. N^erl., vol. 25, livr. 1-2, 



pp. 1-116. 



1929. On a substance causing root formation. Kon. Akad. Wetensch. Am- 



sterdam, Proc. Sec. Sci., vol. 32, Nos. 1-5, pp. 35-39. 

 For more extended discussion and bibliography, see 

 Went, F. W., and Thimann, Kenneth V. 



1937. Phytohormones. Macmillan, New York. 



