References 331 



Hertwig, O. Keimesschadigung durch chemische Eingriffe. Ibid., 



30, I9I3- 

 Hertwig, R. Ueber den derzeitigen Stand des Sexualitatsprob- 



lems. Biol. Centralblatt 32, 1912. 

 Hoppe, H. Die Tatsachen iiber den Alkohol, 4te Aufl. Miinchen, 



1912. 

 Hoy, W. E., Jr. and Muller, H. R. Mitoses in the Epithelium of 



the Convoluted Tubules (of Man). In press. 

 Huxley, T. H. Evolution and Ethics. Romanes Lecture, 1893. 

 James, W. The Energies of Men. Science, 25, 1907. 

 Jennings, H. S. Behavior of the Lower Organisms. New York, 



1906. 

 Jennings, H. S. Heredity, Variation and Evolution in Protozoa. 



Proc. Am. Philos. Soc. 47, 1908. 

 Jennings, H. S. Experimental Evidence of the Effectiveness of 



Selection. Amer. Nat. 44, 1910. 



Jennings, H. S. Heredity and Personality. Science, 34, 1911. 

 Johnson, R. Marriage Selection. Jour. Heredity, 5, 1914. 

 Jordan, D. S. The Human Harvest. Boston, 1907. 

 Jordan, H. E. The Biological Status and Social Worth of the 



Mulatto. Pop. Sci. Monthly, 1913. 

 Kammerer, P. Direkt induzierte Farbanpassungen und deren 



Vererbung. Zeit. fur Induk. Abstam. 4, 1911. 

 King, H. D. Studies on Sex Determination in Amphibians. 



Biol. Bull. 16 and 20, 1909, 1911. Jour. Exp. Zool. 12, 1912. 

 Lang, A. Vorversuche zu Untersuchungen iiber die Varietaten- 



bildung von Helix hortensis und nemoralis. Festschr. f. 



Hackel. Jena, 1904. 

 Lillie, F. R. The Mechanism of Fertilization in Arbacia. Jour. 



Exp. Zool. 16, 1914. 

 Lillie, F. R. The Free-Martin; a Study of the Action of Sex 



Hormones in the Foetal Life of Cattle. Jour. Exp. Zool. 23, 



1917. 

 Lotsy, J. P. La theorie du croisement. Arch, neerl. Sci. Exact. 



et Nat, Ser. 36, T. 2, 1914. 

 MacDougal, D. T. Alterations in Heredity induced by Ovarial 



Treatment. Bot. Gaz. 51, 1911. 

 McClendon, J. F. Chemistry of the Production of One-Eyed 



Monsters. Am. Jour. Phys. 29, 1912. 

 McClung, C. E. The Accessory Chromosome, Sex Determinant? 



Biol. Bull. 3, 1902. 



