598 BIOLOGY OF THE PROTOZOA 



VON WiLLER, P. : 1918, Ueber den Bau des Plasma der niedersten Tiere, Arch. 

 Prot., vol. 38. 



Williams, A. W. and Lowden, M. M.: 1906, Etiology and Diagnosis of Hydro- 

 phobia, Jour. Inf. Dis., vol. 3. 



Willis, H. S.: 1916, The Influence of the Nucleus on the Behavior of Amceba, 

 Biol. Bull., vol. 30. 



Wilson, C. W.: 1916, On the Life History of a Soil Amoeba, Univ. Cal. Pub. ZooL, 

 vol. 16, No. 1(3. 



Wilson, E. B.: 1922, The Physical Basis of Life, Yale Univ. Press., 1922. 1925, 

 The Cell in Development and Heredity, 3d. ed.. New York. 



Winter, F. : 1907, Zur Kenntnis der Thalamophoren. 1. Untersuchungen ilber 

 Peneroplis pertusus. Arch. Prot., vol. 10. 



Wladimirsky, a.: 1916, Are the Infusoria Capable of "Learning" to Select their 

 Food? Russ. Jour. Zool., vol. 1. 



Woodcock: 1906, The Haemoflagellates, Quart. Jour. Mic. Sci., vol. 50 (N. S.). 



Woodruff, L. L.: 1905, An Experimental Study on the Life History of the Hypo- 

 trichous Infusoria, Jour. exp. Zool., vol. 2. 1911, The Effects of Excretion 

 Products of Paramecium on the Rate of Reproduction, Ibid., vol. 10. 1912, 

 Observations on the Origin and Sequence of the Protozoan Fauna of Hay Infus- 

 ions, Ibid., vol. 12. 1914, So-called Conjugating and Non-conjugating Races of 

 Paramecium, Ibid., vol. 16. 1917, The Influence of General Environmental 

 Conditions on the Periodicity of Endomixis in Paramecium aurelia, Biol. Bull, 

 vol. 33. 1921, The Present Status of the Long-continued Pedigree Culture of 

 Paramecium aurelia at Yale Univ., Proe. Nat. Acad. Sci., vol. 7. 1921 (2), 

 Amicronucleate Infusoria, Proc. Soc. exp. Biol. Med., vol. 18. 



Woodruff, L. L., and Erdm.^nn, Rh.: 1914, A Normal Periodic Reorganization 

 Process without Cell Fusion in Paramecium, Jour. Exp. Zool., vol. 17, No. 4. 



Woodruff, L. L., and Moore, L.: 1924, On the Longevity of Spathidium spalhula 

 without findomixis or Conjugation, Proc. Nat. Acad. Sci., vol. 10, No. 5. 



Woodruff, L. L., and Spencer, H.: 1922, On the Method of Macronuclear Disin- 

 tegration During Endomixis in Paramecium aurelia, Proc. Soc. exp. Biol. Med., 

 vol. 19. 1924, Studies on Spathidium spathula. II. The Significance of 

 Conjugation, Jour. Exp. Zool., vol. 39, No. 2. 



YocoM, H. B.: 1918, The Neuromotor Apparatus of Euplotes patella, Univ. Cal. 



Pub. Zool., vol. 18, No. 14. 

 Young, D. B.: 1922, A Contribution to the Morphology and Physiology of the 



Genus Uronychia, Jour. Exp. Zool., vol. 36, No. 3. 

 Young, R. T. : 1917, Experimental Induction of Endomixis in Paramecium aurelia, 



Jour. Exp. Zool, vol. 24. 



Zederb.\ur, E.: 1904, CJeschlechtliche und ungeschlechtliche Fortpflanzung von 



Ceratium hirundineUa, Ber. Deutsch. Bot. Ges., 22. 

 Zuelzer, M.; 1904, Beitriige zur Kenntniss von Difflugia urceolata, Inaug. Diss., 



Heidelberg. 1909, Bau und Entwicklung von Wagnerella horealis, Arch. Prot., 



vol. 17. 

 ZuMSTEiN, H.: 1900, Zur Morphologie und Physiologie der Euglena gracilis 



Pringsh. Jahrb., vol. 34. 

 Zweibaum, T.: 1921, Ricerche spermentali sulla coniugazione degli Infusori, Arch. 



prot., vol. 44. 1922, Ricerchi, etc., II. Influenza della coniugazione sulla 



produzione dei materiali di riserva nel Paramecium caudatum, Ibid., vol. 44. 



