510 FOOD REQUIREMENTS 



1937c. Effects of manganese on the growth of Euglena anahaena, 



Astasia sp. and Colpid'ium campylnm. Arch. Protistenk., 90: 178-84. 



1937d. Effects of different concentrations of sodium acetate on growth 



of Euglena stellata. Anat. Rec, 70 (Suppl.) : 127. 



1938a. Pimehc acid as a growth factor for the ciliate, Colpidium 



campylum. Anat. Rec, 72 (Suppl.) : 110. 



1938b. Nitrogen requirements of Euglena anahaena var. minor. Arch. 



Protistenk., 91: 465-73. 



1939a. The trophic nature of Euglena viridis. Arch. zool. expr. gen., 



80 (N et R.) : 61-67. 



1939b. The trophic nature of the plant-hke flagellates. Quart. Rec. 



Biol., 14: 1-12. 



1939c. Pimelic acid as a growth stimulant for Colpidium campylum. 



Arch. Protistenk., 92: 315-19. 



Hall, R. P., and A. M. Elliott. 1935. Growth of Colpidium in relation to 



certain incomplete proteins and amino acids. Arch. Protistenk., 85: 



443-50. 

 Hall, R. P., and J. B. Loefer. 1936. On the supposed utilization of inorganic 



nitrogen by the colorless cryptomonad flagellate, Chilomonas Paramecium. 



Protoplasma, 26: 321-30. 



1940. Effects of culture filtrates and old medium on growth of the 



ciliate, Colpidium campylum. Proc. Soc. exp. Biol. N. Y., 43: 128-33. 



Hall, R. P., and H. W. Schoenborn. 1938a. Studies on the question of auto- 

 trophic nutrition in Chlorogonium euchlorum, Euglena anahaena and 

 E. deses. Arch. Protistenk., 90: 259-71. 



1938b. The selective action of inorganic media in bacteria-free cultures 



QiEuglena. Anat. Rec, 72 (Suppl.) : 129-30. 



■ 1939a. The question of autotrophic nutrition in Euglena gracilis. 



Physiol. Zool., 12: 76-84. 



1939b. Fluctuations in growth rate of Euglena anahaena, E. gracilis 



and E. viridis and their apparent relation to initial density of population. 

 Physiol. Zool., 12: 201-08. 



Hutner, S. H. 1936. The nutritional requirements of two species of Euglena. 



Arch. Protistenk., 88: 93-106. 

 Jahn, T. L. 1929.* Studies on the physiology of the euglenoid flagellates. 



I. The relation of the density of population to the growth rate of 



Euglena. Biol. Bull., 57: 81-106. 



1931. Studies on the physiology of the euglenoid flagellates. III. The 



effect of hydrogen-ion concentration on the growth of Euglena gracilis. 

 Biol. Bull., 61: 387-99. 



1933a.* Studies on the physiology of the euglenoid flagellates. IV. 



The thermal death time of Euplena gracilis Klebs. Arch. Protistenk., 79: 



o o 



249-62. 



1933b.* Studies on the oxidation-reduction potential of protozoan cul- 



