242 CHEMICAL AGENTS AND GROWTH 



Hamner, K. C, and J. Bonner. 1938. Photoperiodism in relation to hormones 



as factors in floral initiation and development. Botan. Gaz., 100, 388-431. 

 Lona, P., and R. Borghi. 1957. Germogliazione di gemme di Fagus sylvatica 



L. in periodo di quiescenza invernale, a fotoperiodo breve, per azione dell' 



acido ^ibberellico. Ateneo parmense, 28, 1 16-18. 

 Marth, p" C, W. V. Audia, and J. W. Mitchell. 1956. Effects of gibberellic acid 



on growth and development of plants of various genera and species. Botan. 



Gaz., 118, 106-11. 

 Moshkov, B. S., and I. E. Kocherzhenko. 1939. Rooting of woody cuttings 



as dependent upon photoperiodic condition. Compt. rend. acad. sci. U.S.S.R., 



24, 392-95. 

 Nitsch, J. P. 1955. Methods for the investigation of natural auxins and growth 



inhibitors. The Chemistry and Mode of Action of Plant Growth Substances. 



R. L. Wain and F. Wightman, Editors. Butterworths, London, pp. 3-31. 

 Nitsch, J. P. 1957a. Photoperiodism in woody plants. Proc. Am. Soc. Hort. 



Sci., 70, 526-44. 

 Nitsch, J. P. 1957b. Growth responses of woody plants to photoperiodic 



stimuli. Proc. Am. Soc. Hort. Sci., 70, 512-25. 

 Nitsch, J. P., and C. Nitsch. 1956. Studies on the growth of coleoptile and 



first internode sections. A new, sensitive, straight-growth test for auxins. 



Plant Physiol, 31, 94-111. 

 Spiegel, P. 1954. Auxin and inhibitors in canes of Vitis. Bull Research Council 



Israel, 4, 176-83. 

 Waxman, S. 1957. The development of woody plants as affected by photo- 

 periodic treatments. Ph.D. thesis, Cornell University, Ithaca, New York. 

 Went, F. W. 1938. Specific factors other than auxin affecting growth and root 



formation. Plant Physiol, 13, 54-80. 

 Went, F. W., and K. V. Thimann. 1937. Phytohormones. Macmillan, New 



York. 



