564 GROWTH 



linger, W. B. 1931. The protozoan sequence in five plant infusions. Trans. 



Amer. micro. Soc, 50: 144-53. 

 Walker, H. H. 1932. Carbon dioxide as a factor affecting lag in bacterial 



cultures. Science, 76: 602-4. 

 Wang, C. C. 1928. Ecological studies of the seasonal distribution of Protozoa 



in a fresh water pond. J. Morph., 46: 431-78. 

 Wetzel, N. C. 1937. On the motion of growth. XVII. Theoretical foundations. 



Growth, 1: 6-59. 

 Woodruff, L. L. 1905. An experimental study on the life history of 



hypotrichous Infusoria. J. Exp. Zool., 2:585-632. 



1911. The effect of excretion products of Paramecium on its rate 



of reproduction. J. exp. Zool., 10: 557-81. 



1912. Observations on the origin and sequence of the protozoan fauna 



of hay infusions. J. exp. Zool., 12 : 205-64. 



1913a. Cell size, nuclear size and the nuclear cytoplasmic relation during 



the life of a pedigreed race of Oxytricha jallax. J. exp. Zool., 15: 1-22. 



1913b. The effect of excretion products on the same and on different 



species with special reference to the protozoan sequence in infusions. 

 J. exp. Zool., 14: 575-82. 



Woodruff L. L., and G A. Baitsell. 1911a. The reproduction of Paramecium 

 aurelia in a "constant" culture medium of beef extract. J. exp. Zool., 

 11: 135-42. 



1911b. The temperature coefficient of the rate of reproduction of 



Faramecium aurelia. Amer. J. Physiol., 29: 147-55. 



1911c. Rhythms in the reproductive activity of the Infusoria. J. exp. 



Zool., 11: 339-59. 



Wright, E. v., and H. Kersten. 1937. An apparatus for measuring turbidity 



of bacterial suspensions. J. Bact., 34:581-83. 

 Yocom, H. B. 1928. The effect of the quantity of culture medium on the 



division rate of Oxytricha. Biol. Bull., 54: 410-16. 



1934. Observations on the experimental adaptation of certain fresh 



water ciliates to sea water. Biol. Bull., 67 : 273-76. 



Zhalkovskii, B. G 1938. The differences in biological action of transmitted 

 and reflected light. I. Experiments with Paramecium caudatum. Bull, 

 biol. exp. med. U. R. S. S. 493-95. From Chem. Abstr., 1939, 33: 2544. 



Ziegler, N. R., and H. O. Halvorson. 1935. Application of statistics to prob- 

 lems in bacteriology. IV. Experimental comparison of the dilution method, 

 the plate count, and the direct count for the determination of bacterial 

 populations. J. Bact., 29: 609-34. 



