PHYSIOLOGY 139 



Heidt, K. : (1937) Form und Struktur der Paramylonkorper von 

 Euglena sanguinca. Arch. Protist., 88:127. 



Herfs, A.: (1922) Die pulsierende Vakuole der Protozoen, ein 

 Schutzorgan gegen Ausslissung. Ibid., 44:227. 



Hogue, Mary J.: (1923) Contractile vacuoles in amoebae, etc. J. E. 

 Mitchell Sc. Soc, 39:49. 



Holter, H.: (1950) The function of cell inclusions in the metabo- 

 lism of Chaos chaos. Ann. New York Acad. Sc, 50: 1000. 



and Doyle, W. L. : (1938) Studies on enzymatic histochem- 

 istry. J. Cell. Comp. Physiol., 12:295. 



(1938a) Ueber die Lokalisation der Amylase in Amoe- 



ben. C. R. Lab. Carlesberg., Ser. Chim., 22:219. 

 — and Kopac, M. J.: (1937) Localization of peptidase in the 

 ameba. J. Cell. Comp. Physiol, 10:423. 



and Lovtrtjp, S.: (1949) Proteolytic enzymes in Chaos chaos. 



C. R. Lab. Carlesberg., Ser. Chim., 27:27. 



Hopkins, D. L. : (1938) The vacuoles and vacuolar activity in the 

 marine amoeba, etc. Biodynamica, 34, 22 pp. 



and Warner, Kay L. : (1946) Functional cytology of Enta- 

 moeba histolytica. J. Parasitol., 32:175. 



Horvath, J.: (1950) Vitalitatsausserung einer mikronukleuslosen 

 Bodenziliate in der vegetativen Fortpflanzung. Oesterr. zool. 

 Ztschr., 2:336. 



Howland, Ruth B.: (1928) The pH of gastric vacuoles. Proto- 

 plasma, 5:127. 



and Bernstein, A.: (1931) A method for determining the 



oxygen consumption of a single cell. J. Gen. Physiol., 14:339. 



Hulpieu, H. R. : (1930) The effect of oxvgen on Amoeba proteus. 

 J. Exper. Zool., 56:321. 



Hutner, S. H. and Provasoli, L. : (1951) The phytoflagellates. In: 

 Lwoff (1951). 



Hyman, Libby H. : (1917) Metabolic gradients in Amoeba and their 

 relation to the mechanism of amoeboid movement. J. Exper. 

 Zool, 24:55. 



Jahn, T. L. : (1941) Respiratory metabolism. In: Calkins and Sum- 

 mers (1941). 



Jennings, H. S.: (1904) Contributions to the study of the behavior 

 of the lower organisms. Publ. Carnegie Inst. Washington, No. 

 16. 



(1906) Behavior of the lower organisms. New York. 



Jirovec, O.: (1926) Protozoenstudien. I. Arch. Protist., 56:280. 



Kahler, H., Chalkley, H. W. and Voegtlin, C: (1929) The na- 

 ture of the effect of a high-frequency electric field upon Para- 

 mecium. Publ. Health Report, 44:339. 



Kepner, W. A. and Whitlock, W. C: (1921) Food reactions of 

 Amoeba proteus. J. Exper. Zool, 32:397. 



Khainsky, A.: (1910) Zur Morphologie und Physiologie einiger In- 

 fusorien, etc. Arch. Protist., 21:1. 



Kidder, G. W. : (1951) Nutrition and metabolism of Protozoa. Ann. 

 Rev. Microbiol, 5:139. 



