spirostomum ambiguum 431 



8. Literature. 



1. Baitsell, G. A. (1912). — " Experiments on the Reproduction of the 



Hypotrichous Infusoria. I. Conjugation between closely related 

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2. (1914). — " Experiments on the Reproduction of the Hypotrichous 



Infusoria. II. A study of the so-called life-cycle in Oxytricha 

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3. Biitschli, O. (1889).— " Protozoa. Part III. Infusoria", ' Bronn's 



Klassen und Ordnungen des Thier-Reichs ', Leipzig. 



4. Calkins, G. N. (1919). — " Uroleptus mobUis. I. History of the nuclei 



during division and conjugation ", ' Journal of Experimental 

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5. Claparede, E., and Lachmann, J. (1858). — "Etude sur les Infusoires 



et les Rhizopodes ", ' Mem. Inst. Genevoise ', 1858. 



6. Colhn, B. (1912). — " Etude monographique sur les Acinetiens ", 



' Archives de Zoologie experimentale et generale ', tome 51. 



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' Suite a Buffon ', Paris. 



8. Greenwood, M. (1894). — " On the constitution and mode of formation 



of food vacuoles in Infusoria ", ' Phil. Trans. Roy. Soc.', London, 

 (B) clxxxv. 



9. ■ (1896). — " On structural change in the resting nucleus of 



Protozoa. Parti. The macronucleus of Care hesium poly pinum ", 

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10. Hargitt, G. T., and Fray, W. (1917). — " The growth of Paramoecium 



in pure cidtures of Bacteria ", ' Journal of Experimental Zoology ', 

 Philadelphia, vol. 22, no. 2. 



11. Hopkins, H. S. (1921). — " Condition for Conjugation in diverse races of 



Paramoecium ", ibid., vol. 34, no. 3. 



12. Jennings, H. S. (1915). — 'Behaviour of the Lower Organisms', 



Columbia University Press. 



13. Johnson, H. P. (1893). — "A contribution to the Morphology and 



Biology of the Stentors ", ' Journal of Morphology ', vol. 8. 



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scher Anzeiger ', Bd. 24. 



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mental Zoology ', Philadelphia, vol. 17, no. 1. 



17. Maupas, E. (1879). — " Micronucleus of Stentor coeruieus and Spiro- 



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