60 MISSOURI AGR. EXP. STA. RESEARCH BULLETIN NO. 21 



88." Pfeffer, W. Pflanzenphysiologie Bd. II, 1904. Especially 

 the chapter on Periodicity. 



89. Preston, J. P. and Phillips, F. J. Seasonal variations in the 



food reserves of trees. Forestry Quart. 9 (1911) p. 232. 



90. Pollitt, J. The influence of electricity and anaesthetics upon 



plants. Jour. Dept. Agr. W. Australia 15, pp. 451-454. 



91. Polowzow, W. Experimentelle Untersuchungen uber die 



Reizerscheinungen der Pflanzen. Ber. d. d. Bot. Ges. 

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92. Puriwitsch, K. (See Butkewitsch.) 



93. Reinhardt u. Suschkow. Beit, zur. Starkebildung in der 



Pflanze. Bot. Centlb. Beihefte 18, p. 133. 



94. Richards, H. M. and McDougal. The influence of CO2 and 



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95. Samuely, F. Oppenheimers Handbuch der Biochemie I, 



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96. Sandsten, E. P. Influence of gases and vapors on growth of 



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97. Schroeder, H. Ueber die Einwirkung von Aethylaether auf 



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98. Schmidt. The relations bet. oxidation ferments and respira- 



tion in plants. Bot. Centlb. (1912) 119 pp. 192-493. 



99. Simon, S. Untersuchungen uber das Verhalten einiger 



Wachstums funktionen sowie die Atmungs tatigkeit der 

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100. Stoklaska, J. and Creny. Isolierung des die anarobischen 



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101. Stuart, W. The role of anesthetics and other agents in plant 



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102. Townsend, C. C. The correlation of growth under the influence 



of injuries. Ann. Bot. 11 (1897), 509-532. 



103. Vinson, A. E. The influence of chemicals in stimulating the 



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104. Waters, C. E. The resting period of plants. Plant World 6, 



pp. 154-156. 



105. Weber, F. Untersuchungen uber die Wandlungen des Starke 



und Fettegehaltes der Pflanzen insbesondere der Baume. 

 Bot. Centrlb. 113 (1910) p. 166. 



106. Weber, F. Shortening the rest period of shoots by wounding 



and injection. Exp. Sta. Rec. 27, p. 221. 



