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SUN RAYS AND PLANT LIFE— JOHNSTON 371 



Flint, Lewis H., and McAxisteb, E. D. 



1935. Wave leugths of radiation in the visible spectrum inhibiting the 

 germination of light-sensitive lettuce seed. Smithsonian Misc. Coll., 

 vol. 94, no. 5, pp. 1-11. 

 Gabnee, W. W. 



1932. Comparative responses of long-day and short-day plants to relative 

 length of day and night. Plant Phys., vol. 8, pp. 347-356. 

 Gaenek, W. W., and Allabd, H. A. 



1920. Flowering and fruiting of plants as controlled by the length of day. 



U. S. Dep. Agr. Year Book, pp. 377-400. 

 1925. Localization of the response in plants to relative length of day and 

 night. Journ. Agr. Res., vol. 31, pp. 555-566. 



1931. Effect of abnormally long and short alternations of light and dark- 



ness on growth and development of plants. Journ. Agr. Res., vol. 

 42, pp. 629-651. 



HOOVEK, W. H. 



1937. The dependence of carbon dioxide assimilation in a higher plant on 

 wave length of radiation. Smithsonian Misc. Coll., vol. 95, no. 21, 

 pp. 1-13. 

 Johnston, Earl S. 



1921. The seasonal march of the climatic conditions of a greenhouse, as 



related to plant growth. Univ. Maryland Agr. Exp. Stat. Bull. 245. 



1932. The function of radiation in the physiology of plants. II. Som^- effects 



of near infrared radiation on plants. Smithsonian Misc. Coll., vol. 

 87, no. 14, pp. 1-15. 



1934. Phototropic sensitivity in relation to wave length. Smithsonian Misc. 



Coll., vol. 92, no. 11, pp. 1-17. 

 1935 a. Phototropism : A specific growth response to light. Smithsonian 



Ann. Rep. 1934, 313-323. 

 1935 b. Aerial fertilization of wheat plants with carbon dioxide gas. Smith- 

 sonian Misc. Coll., vol. 94, no. 15, pp. 1-9. 

 Livingston, B. E. 



1915. Atmometry and the porous cup atmometer. Plant "World, vol. 18, pp. 

 21-30, 51-74, 95-111, 143-149. 

 MoAlistee, E. D. 



1935. The Christiansen light filter : Its advantages and limitations. Smith- 



sonian Misc. Coll., vol. 93, no. 7, pp. 1-12. 

 Meier, Florence E. 



1936. Lethal effect of short wave lengths of the ultraviolet on the alga 



ChloreUa vulgaris. Smithsonian Misc. Coll., vol, 95, no. 2, pp. 

 1-19. 



WiTHEOW, ROBEKT B. 



1934. Plant forcing with electric lights. Indiana Agr. Exp. Stat. Circ. 206. 

 WiTHBow, R. B., and Benedict, H. M. 



1936. Photoperiodic responses of certain greenhouse annuals as influenced 

 by intensity and wave length of artificial light used to lengthen the 

 daylight period. Plant Phys., vol. 11, pp. 225-249. 

 WiTHROw, RoBBatT B., and Richman, Milford W. 



1933. Artificial radiation as a means of forcing greenhouse crops. Indiana 



Agr. Exp. Stat. Bull. 380. 



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