556 PLANT GROWTH AND PLANT COMMUNITIES 



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Gregory, F. G., 1928. "Studies in the Energy Relations of Plants, II: The Effect 

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Gregory, F. G., 1926. "The Effect of Climatic Conditions on the Growth of Barley," 

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Gregory, F. G., 1928. "The Analysis of Growth Curves: A Reply to Criticism," 

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Homberger, R., 1885. "Untersuchungen iiber Gehalt und Zunahmen von Sinapis 

 alba an Troekensubstanz und chemischen Bestandtheilen in 7 tatigen 

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Kidd, F., West, C, and Briggs, G. E., 1920. "What Is the Significance of the 

 Efficiency Index of Plant Growth?" New Phijtol. 19, 88. 



Kreusler, U., Prehn, A., and Becker, G., 1877. "Beobachtungen iiber Wachsthum 

 der Maispflanze," Landw. Jahrb. 6, 759. 



Milthorpe, F. L., 1959. "Studies in the Expansion of Leaf Surface, I: The Influence 

 of Temperature," /. Exp. Bot. 10, 233. 



Sargent, J. A., and Wangermann, E., 1959. "The Effect of Some Growth Reg- 

 ulators on the Vascular System of Lemna minor," Neto Phtjtol. 58, 345. 



Shantz, E. M., and Steward, F. C, 1955. "The Identification of Compound A 

 from Coconut Milk as 1,3-Diphenylurea," /. Am. Chem. Soc. 77, 6351. 



Thurston, J. M., 1959. "A Comparative Study of the Growth of Wild Oats (Avena 

 fatua and A. ludoviciana Dur. ) and of Cultivated Cereals with Varied Nitro- 

 gen Supply," Ann. Appl. Biol. 47, 716. 



Watson, D. J., and Baptiste, E. C. D., 1938. "A Comparative Physiological Study 

 of Sugar-Beet and Mangold with Respect to Growth and Sugar Accumulation, 

 I: Growth Analysis of the Crop in the Field," Ann. Bot. N.S. 9, 437. 



Williams, R. F., 1946. "The Physiology of Plant Growth with Special Reference 

 to the Concepts of Net Assimilation Rate," Ann. Bot. N.S. 10, 41. 



