PARAMOECIUM POSSESSING EXTRA VACUOLES 327 



X. BIBLIOGRAPHY 



(1) Calkins, G. N. 1909 Protozoology. Lea and Febiger. 



(2) Hance, R. T. 1915 The inheritance of extra contractile vacuoles in an 



unusual race of Paramoecium caudatum. Science N. S., 42, October 1. 



(3) 1916 Notes on handling protozoa in pure line work. Trans. Amer. 

 Mic. Soc, 35, no. 2, April. 



(4) Jennings, H. S. 1910 What conditions induce conjugation in paramoe- 



cium. Jour. Exp. Zool., 9. 



(5) 1916 Heredity, variation, and the results of selection in the unipa- 

 rental reproduction of DifHugia corona. Genetics 1, September. 



(6) MiNCHiN, E. 1912 Protozoology. London, Arnold. 



(7) Woodruff, L. L. 1908 The life-cycle of paramoecium when subjected to 



a varied environment. Amer. Nat. 42, 520-526. 



(8) 1910 Two thousand generations of paramoecium. Arch, f Protisk., 

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(9) 1911 The effect of excretion products t)f paramoecium on its rate of 

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(10) Woodruff, L. L. and Baitsell, G. A. 1911 The reproduction of Para- 



moecium aurelia in a constant culture medium of beef extract. 



(11) Shumway, W. 1917 The effect of a thyroid diet upon paramoecium. 



Jour. Exp. Zool., vol. 22, no. 3. 



