NUTRITION 229 



Hooker, H. D., Jr. Seasonal Changes in the Chemical Composition of Apple Spurs. 



Mo. Agr. Exp. Sta. Res. Bui. 40. 1920. 

 Hedrick, U. P. Twenty Years of Fertilizers in an Apple Orchard. N. Y. Agr. Exp. 



Sta. Bui. 460. 1920. 

 Roberts, R. H, Off-year Apple Bearing. Wis. Agr. Exp. Sta. Bui. 317. 1920. 

 Bedford, H. A. R., and Pickering, S. U. The Effect of Grass on Trees, etc. Pp. 



259-312. Science and Fruit Growing. London, 1919. 

 Jorgensen, I., and Stiles, W. Carbon Assimilation. New Phytologist Reprint 



No. 10. London, 1917. 

 Palladin, V. I. Plant Physiology, Edit, by B. E. Livingston. Chapters 3, 4, 5, 7, 8. 



Pp. 60-117 and 139-212. Phila., 1918. 

 Russell, E. J. Soil Conditions and Plant Growth, Chapters 2, 6, 7. Pp. 19-51 and 



117-152. London, 1915. 



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