PHYSIOLOGICAL VARIATIONS IN PARAMECIUM 525 



Maupas, E. 1888 Recherches experimentales sur la multiplication des infusoires 



cilies. Arch. d. Zool. Exp. et Gen (2), vol. 6, p. 165. 



1889 La rajeunissement karyogamique chez les cilies. Arch. d. Zool. 



Exp. e. gen. (2), vol. 7, p. 149. 

 Moody, J. E. 1912 Observations on the life history of two rare ciliates. Spath- 



idium spathula and Actinobolus radians. Jour. Morph., vol. 23, no. 3, 



p. 349. 

 Simpson, J. Y. 1901 Observations on binary fission in the life history of ciliata. 



Proc. Roy. Soc. Edinburgh, 1901, p. 401. 

 Woodruff, L. L. 1905 An experimental study on the life history of hypotrich- 



ous infusoria. Jour. Exp. Zool., vol. 2, no. 4, p. 585. 



1909 (2) Further studies on the life cycle of Paramecium. Biol. Bull., 



vol. 17, no. 4, p. 287. 



1911 Two thousand generations of Paramecium. Arch. f. Prot., vol. 



21, p. 263. 



and Baitsell, G. A. 1911 The reproduction of Paramecium aurelia in 



a 'constant' culture medium of beef extract. Jour. Exp. Zool., vol. 11, 



no. 1, p. 135. 

 ZwEiBAUM, J. 1912 La conjugaison et la differentiation sexuelle chez les infus- 

 oires. V. Les conditions necessaires et sufEsantcs pour la conjugaison 



du Paramecium caudatum. Arch. f. Prot. vol. 26, p. 275. 



