60 BULLETIN 1121, U. S. DEPARTMENT OF AGRICULTURE. 
KEEBLE, F., and PELLEw, C. 
1910. The mode of inheritance of stature and of time of flowering in peas (Pisum 
satwwum). Jour. Gen., v. 1, p. 47-56. 
Kine, HELEN D. 
1918. Studies on inbreeding. I. The effects of inbreeding on the growth 
and variability in body weight of the albino rat. Jour. Expt. Zool., 
v. 26, p. 1-54. 
1918. Studies on inbreeding. II. The effects of inbreeding on the fertility 
and on the constitutional vigor of the albino rat. Jour. Expt. Zool. 
v. 26, p. 55-98. 
1918. Studies on inbreeding. III. The effects of inbreeding with selection, 
on the sex ratio of the albino rat. Jour. Expt. Zool., v. 27, p. 1-35. 
1919. Studies on inbreeding. IV. A further study of the effects of inbreeding 
on the growth and variability in the body weight of the albino rat. 
Jour. Expt. Zool., v. 29, p. 134-175. 
MoENKHAUS, W. J. 
1911. The effects of inbreeding and selection on fertility, vigor and sex ratio 
of Drosophila ampelophila. Jour. Morph., v. 22, p. 123-154. 
Moraan, T. H., SturTEVANT, A. H., Mutusr, H. J., Bripcss, C. B. 
1915. The mechanism of Mendelian heredity. 262 p. 
PEARL, R. 
1913. A contribution toward an analysis of the problem of inbreeding. Amer. 
Nat. v. 47, p. 577-614. 
1914. On the results of inbreeding a Mendelian population; a correction and ex- 
tension of previous conclusions. Amer. Nat., v. 48, p. 57-62. 
RitzEMa-Bos, J. 
1894. Untersuchungen tiber die Folgen der Zucht in engster Blutverwandtschait. 
Biol. Centbl., v. 14, p. 75-81. 
SHULL, G. H. 
1908. The composition of a field of maize. Amer. Breed. Assoc. Rpt. 1908, v. 
4, p. 296-301. 
1911. The genotypes of maize. Amer. Nat., v. 45, p. 234-252. 
Suutt, A. F. 
1912. The influence of inbreeding on vigor in Hydatina senta. Biol. Bul., v. 24, 
p. 1-18. 
WEISMANN, A. 
1904. The evolution theory. (Trans. J. A. Thomson and M. R. Thomson.) 
London, 1904, 2 vols. 
WENTWORTH, E. N. 
1913. The segregation of fecundity factors in Drosophila. Jour. Gen., v. 3, 
p. 113-120. 
Wuitney, D. D. 
1912. Reinvigoration produced by cross fertilization in Hydatina senta. Jour. 
Expt. Zool., v. 12, p. 337-362. 
Wricut, S. 
1920. The relative importance of heredity and environment in determining the 
piebald pattern of guinea pigs, Proc. Nat. Acad. Sci., v. 6, p. 320-332. 
1921. Systems of mating. Genetics, v. 6, p. 111-178. 
Wriaat, S., and Lewis, P. A. 
1921. Factors in the resistance of guinea pigs to tuberculosis with especial regard 
to inbreeding and heredity. Amer. Nat., v. 55, p. 20-80. 
ZELENY, C. 
1920. The tabulation of factorial values. Amer. Nat., v. 54, p. 358-362. 
