BIBLIOGRAPHY 409 



. 1915. Maternal instinct in a monkey. Jour. An. Behav. 5:403-5. 



Yerkes, R. M., and A. W. i92jp. The Great Apes. A Study of Anthropoid Life. 

 New Haven: Yale University Press. 652 pp. 



YocoM, H. B. 1928. The effect of the quantity of culture medium on the divi- 

 sion rate of Oxytricha. Biol. Bidl. 54:410-17. 



Young, W. C. 1929. A study of the function of the epididymus. I. Is the 

 attainment of full spermatozoon maturity attributable to some specific ac- 

 tion of the epididymal secretion? Jour. Morph. and Physiol. 47:479-95. 



Yung, E. 1878. Contributions a I'histoire de I'influence des milieus physiques 

 sur les etres vivants. Arch. Zool. Exp. et Gen. 7:251-82. 



. 1885. De I'influence des variations du milieu physico-chimique sur le 



developpement des animaux. Arch, des Sci. Phys. et Nat. 14:502-22. 



Zander, E. 1921. Das Leben der Biene. Stuttgart: Ulmer. 103 pp. 



