86 PLANT GROWTH 



REFERENCES 



Garner, W. W., and H. A. Allard, "Further Studies in Photoperiodism, the Response of 

 the Plant to Relative Length of Day and Night," Journal of Agricultural Research, 

 vol. 23, pp. 871-920, 1923. 



Garner, W. W., "Recent Work on Photoperiodism,". The Botanical Review, vol. 3, pp. 

 259-276, 1937. 



Transeau, E. N., H. C. Sampson, and L. H. Tiffany. Textbook of Botany, Harper and 



Brothers, 1940. 



