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1921 Microbiology. 

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1883 Contribution a 1'etude morphologique et anatomique des infusoires cilies. 

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1912 An Introduction to the Study of the Protozoa. 

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1908 Ueber die Wirkung des schildrusen Extrahts und einiger anderer Organ- 

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 Pritchard, A. 



1861 A History of the Infusoria. London. 986 pp. (The contractile vesi- 

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 Riddle, M. C., and Torrey, H. B. 



1923 The Physiological Response of Paramecium to Thyroxin. Anatomical 



Record, Vol. 24, p. 396. 

 Shumway, U. 



1917 The Effect of a Thyroid Diet on Paramecium. Jour. Exp. Zool., Vol. 22, 



PP- 529-562. 

 Siebold, C. Th., and Stannius, H. 



1854 Comparative Anatomy. Translated and edited by Waldo I. Burnett. 

 Stempell, W. 



1914 Ueber die Funktion der pulsierende Vacuole und einen Apparat zur 

 Demonstrationen derselben. Zoologischer Jahrbiicher, Abteilung fur 

 Allgemeine Zoologie und Physiologie der Tiere. Bd. 34, S. 437-478. 

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1925 Improved Micromanipulation Apparatus. University of California. 



Publications in Zoology, Vol. 26, pp. 443-454. 

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1911 The Effect of Excretion Products of Paramecium on its Rate of Repro- 

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1910 Ueber den influss des Meerwassers auf die pulsierende Vacuole. Archiv 

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