320 CONTROL OF REPRODUCTION 



-. 1935. Earliness of sexual reproduction in wheat as influenced by tem- 



perature and light in relation to growth phases. /. Agr. Research, 51, 621-41. 

 Okuda, M. 1953. Flower formation of Xanthiitm canadense under long day 



conditions induced by grafting with long day plants. Botan. Mag. (Tokyo), 



66, 247-55. 

 Parker, M. W., S. B. Hendricks, H. A. Borthwick, and N. J. Scully. 1946. 



Action spectrum for the photoperiodic control of floral initiation of short day 



plants. Botan. Gaz., 108, 1-26. 

 Parker, M. W., S. B. Hendricks, and H. A. Borthwick. 1950. Action spectrum 



for the photoperiodic control of floral initiation of the long day plant, 



Hyoscyamus niger. Botan. Gaz-, 11 1, 242-52. 

 Purvis, O. N. 1934. An analysis of the influence of temperature during germina- 

 tion on the subsequent development of certain winter cereals and its relation 



to the efl'ect of length of day. Ann. Botany, 1 , 919-55. 

 Resende, F. 1952. "Long-short" day plants. Portiigaliae Acta Biol. A3, 318-21. 

 . 1953. Acerca do impulso floral em plantas de "dia curto-lungo" e 



plantas de "dia lungo-curto." Rev. fac. cienc. Lisboa, 2C3, 447-534. 

 Sachs, R. M. 1956a. Floral initiation in Cestnim noctiirnwn. I. A long-short 



day plant. Plant Physiol, 31, 185-92. 

 . 1956b. Floral initiation in Cestnim nocturnum, a long-short day plant. 



IL A 24-hour versus a 16-hour photoperiod for long day induction. Plant 



Physiol., 31, 429-30. 



1956c. Floral initiation in Cestrum nocturnum, a long-short day plant. 



in. The effect of temperature upon long day and short day induction. Plant 

 Physiol., 31, 430-33. 

 Wellensiek, S. J. 1953. De physiolgie der bloemvormung in Campanula medium. 

 Proc. Koninkl. Ned. Akad. Wetenschap., 62, 115-18. 



