THE PHOTOPERIODIC PROCESS 253 



Carr, D. J. 1953. On the nature of photoperiodic induction. II. Photoperiodic 



treatments of debudded plants. Physiol. Plantarum, 6, 680-84. 

 Downs, R. J. 1956. Photoreversibility of flower initiation. Plant Physiol, 31, 



279-84. 

 Garner, W. W., and H. A. Allard. 1920. Efi'ect of relative length of day and 



night and other factors of the environment on the growth and reproduction 



in plants. /. Agr. Research, 18, 553-606. 

 Hamner, K. C. 1938. Unpublished, University of Chicago, Illinois. 

 . 1940. Interrelation of light and darkness in photoperiodic induction. 



Botan. Gaz; 101, 658-87. 

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



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

 Harder, R., and G. Glimmer. 1947. Uber die untere kritische Tageslange 



verschiedener Lichtdunkelrythmen. Planta, 35, 88-99. 

 Katunskij, V. M. 1936. Short periodical illumination as a method of controlling 



the development of plant organisms. Compt. rend. acad. sci. U.R.S.S., 3, 



303-304. 

 Knott, J. E. 1934. Effect of a localized photoperiod on spinach. Proc. Am. Soc. 



Hart. Sci., 31, 152-54. 

 Kuiper, J., and L. K. Wiersum. 1936. Occurrence and transport of a substance 



causing flowering in the soybean. Proc. Kon. Acad. Sci. Amsterdam, 39, 



1114-22. 

 Lang, A. 1952. Physiology of flowering. Ann. Rev. Plant Physiol, 3, 265-306. 



. 1954. Unpublished. University of California, Los Angeles. 



Lang, A., and G. Melchers. 1943. Die photoperiodische reaktion von Hy- 



oscyamiis niger. Planta, 33, 653-702. 

 Lang, A., and G. Melchers. 1948. Auslosung von Blutenbildung bei Langtag- 



pflanzen unter Kurtztagbedingungen durch Aufpfropfung von Kurtztag- 



pflanzen. Z. Natwforsch., 3h, 108. 

 Lincoln, R. 1954. Unpublished. University of California, Los Angeles. 

 Liverman, J. L., and J. Bonner. 1953. Biochemistry of the photoperiodic 



response: the high intensity light reaction. Botan. Gaz., 115, 121-28. 

 Lockhart, J. A. 19^56. Unpublished. California Institute of Technology, Pasa- 

 dena. 

 Lockhart, J. A., and K. C. Hamner. 1954. Partial reactions in the formation of 



the floral stimulus in Xanthium. Plant Physiol, 29, 509-13. 

 Long, E. M. 1939. Photoperiodic induction as influenced by environmental 



factors. Botan. Gaz., 101, 168-88. 

 Melchers, G., and A. Lang. 1941. Weitere untersuchungen zur Frage der 



BlUhhormone. Biol. Zeritr., 61, 16. 

 Moshkov, B. S. 1937. Flowering of short day plants under continuous day 



as a result of grafting. Bull.Appl Botany Genet. Plant Breeding, 21 A, 



(Suppl.) 145-56. 

 Nakayama, S. 1955. The effects of certain metabolic inhibitors on the dark 



reaction during photoperiodic treatment. Botan. Mag. Tokyo, 68, 61-62. 

 Naylor, F. L. 1941. Effect of length of induction period on floral development 



of Xanthium pensylvanicum. Botan. Gaz., 103, 146-54. 



