852 



BIOLOGICAL EFFECTS OF RADIATION 



15. Karrer, Enoch. The luminous efficiency of the radiation of the electric arc. 

 Jour. Franklin Inst. 182: 538. 1916. 



16. LeClerg, E. L. The relation of leaf blight to sun scald of honeydew melons. 

 Phytopath. 21 : 97-98. 1931. 



17. LuNDEGARDH, Henrik. Der Temperaturfaktor bei Kohlensaureassimilation 

 und Atmung. Biochem. Zeitsch. 154: 195-234. 1924. 



18. Ramsey, G. B. Blemishes and discolorations caused by sunlight. Blemishes 

 and discolorations of market onions. U. S. Dept. Agr. Circ. 135. 2-4. 1930. 



19. Sayre, J. D. The development of chlorophyll in seedlings in different ranges of 

 wave lengths of light. Plant Physiol. 3: 71-77. 1928. 



20. Sayre, J. D. Opening of stomata in different ranges of wave lengths of light. 

 Plant Physiol. 4 : 323-328. 1929. 



21. Ursprung, a. tJber die Absorptionskurve des griinen Farbsto fifes lebender 

 Blatter. Ber. Deutsch. Botan. Ges. 36: 73-85. 1918. 



Manuscript received by the editor January, 1934. 



