54 BIBLIOGRAPHY. 



MacDowell, E. C. 



1915. Bristle inheritance in Drosophila. I. Extra bristles. Jour. Exper. Zool., 19. 



1916. Piebald rats and multiple factors. Amer. Nat., 50. 



1917. Bristle inheritance in Drosophila. II. Selection. Jour. Exper. Zool., 23. 

 Maeshall, W. W., and H. J. Muller. 



1917. The effect of long-continued heterozygosis on a variable character in Droso- 

 phila. Jour. Exper. Zool., 22. 



MiDDLETON, A. R. 



1915. Heritable variations and the results of selection in the fission rate of Stylonychia 

 ptistulata. Jour. Exper. Zool., 19. 

 Morgan, T. H., A. H. Sturtevant, H. J. Muller, and C. B. Bridges. 



1915. The mechanism of Mendelian heredity. New York. 

 Muller, H. J. 



1914a. The bearing of the selection experiments of Castle and Philhps on the variability 



of genes. Amer. Nat., 48. 

 19146. A gene for the fourth chromosome of Drosophila. Jour. E.xper. Zool., 17. 



1916. The mechanism of crossing over. Amer. Nat., 50. 



1917. An Oenothera-like case in Drosophila. Proc. Nat. Acad. Sci., 3. 

 Pearson, K. 



1911. On the probabiUty that two independent distributions of frequency are really 



samples from the same population. Biometrika, 8. 

 Spillman, W. J. 



1907. Inheritance of the belt in Hampshire swine. Science, n. s., 26. 

 Sturtevant, A. H. 



1912. A critical examination of recent studies on color inheritance in horses. Journ. 



Genet., 2. 



