Experimental Hybridizing 97 



The gray {F-^ hybrids were paired with albinos and 537 

 young produced, of which 261 were albinos and 276 colored — 

 a close approximation to the expected equahty. The colors 

 were of various kinds, but gray greatly predominated. When 

 gray {F^ hybrids were inbred, they produced 119 albinos and 

 308 colored — a rough approximation to the expectation of 

 I to 3. 



Haacke has pubhshed the results of a large number of crosses 

 between white mice, colored mice, and Japanese waltzing mice. 

 Although his experiments were not carried out to test the Men- 

 deHan law, yet, as the author points out, they closely conform 

 to this law. Haacke states his general conclusion in a some- 

 what involved way, namely, that the possible races of species 

 equal the number of possible kinds of germ-cells, i.e. equal 

 a sum that consists of as many factors as a particular species 

 has independently variable qualities or germinal portions. In 

 the sum each factor equals the number of all possible modifica- 

 tions of its properties. 



LITERATURE, CHAPTER VII 



Allen, G. M. The Heredity of Coat Color in Mice. Proc. of the Amer. 



Acad, of Arts and Sci. XL. 1904. 

 Bateson, W. The Present State of Knowledge of Color-Heredity in Mice 



and Rats. Proc. Zool. Soc. II. London. 1903. 

 Castle, W. E., and Allen, G. The Heredity of Albinism. Proc. Amer. 



Acad, of Arts and Sci. XXXVIII. 1903. 

 CuENOT, L. La loi de Mendel et I'heredite de la pigmentation chez les 

 souris. Arch. Zool. Exper. et Gen. Ser. 3, X. Notes et Revue. 

 1902. 

 La loi de Mendel et 1 'heredite de la pigmentation chez les souris. 



Compt. Rend. CXXXIV. Paris. 1902. 

 L'heredite de la pigmentation chez les souris (2™^ note). Arch. Zool. 



Exper. et Gen. Ser. 4, I. Notes et Revue. 1903. 

 L'heredite de la pigmentation chez les souris (3'"'' note) . Arch. Zool. 



Exper. et Gen. Ser. 4, II. Notes et Revue. 1904. 

 Les Races Pures et leurs Combinaisons chez les souris. Arch, de 

 Zool. Exper. et Gen. Ser. 4, III. Notes et Revue, 1905. 

 Darbishire, a. D. Note on the Results of crossing Japanese Waltz- 

 ing Mice with European Albino Races. Biometrika, II. 1903. 

 Second Report on the Result of crossing Japanese Watzing Mice with 

 European Albino Mice. Biometrika, 11. 1903. 



H 



