The Light Relation 435 



Exp. Sta. Bui. 30 : 83-122, 1891 ; 42 : 131-146, 1892 ; 66 : 

 145-157, 1893. 



DUGGAR, B. M. Shading Plants. Cyclopedia of American Ag- 

 riculture. 1 : 119-123, 1907. 



HABERLANDT, G. Lichtsinnesorgane der Laubblatter, 1905. 



KNIEP, H., UNO MINDER, F. Ueber den Einfluss versch. Lichtes 

 a. d. Kohlensaure-assimilation. Zeit. Bot. 1 : 619-650, 1909. 



MACDOUGAL, D. T. The Influence of Light and Darkness upon 

 Growth and Development. Memoirs N.Y. Bot. Gard. 2 : 

 319 pp., 176 figs., 1903. 



RANE, F. W. Electro-Horticulture. W. Va. Agl. Exp. Sta. 

 Bui. 37 : 1894. 



SIEMENS, C. W. On the Influence of Electric Light on Vegeta- 

 tion. Proc. Roy. Soc. 30:210-219. 



STEWART, J. B. The Production of Cigar-Wrapper Tobacco 

 under Shade in the Connecticut Valley. Bur. of Plant Ind. 

 U. S. Dept. Agl. Bui. 138 : 31 pp., 5 pis., 1908. 



STONE, G. E. Response of Plants to Artificial Lights. Cyclo- 

 pedia of American Agriculture. 2 : 22-27, 1907. 



TEODORESCO, E. Influence des differentes radiations lumi- 

 neuses sur la forme et la structure des plantes. Ann. d. Sci. 

 Nat. (Bot.). 10 (ser. 8) : 141-263, pis. 5-8, 1899. 



WAGER, H. The Perception of Light in Plants. Ann. Bot. 

 23 : 459-489, 2 pis., 1909. 



WHITNEY, M. Growing Sumatra Tobacco under Shade. Bu- 

 reau Soils, U. S. Dept. Agl. Bui. 20 : 31 pp., 7 pis., 1902. 



TEXTS. Clements, Jost, MacDougal, Pfeffer. 



