332 Spotting in Mice and their Genetic Behaviour 



In that paper he dealt with both the yellow and the "Daruma" 

 races. From his anatomical figures his facts seem to actually break 

 down the homozygous " Daruma " embryo in the early stage of ontogeny 

 like that of the homozygous yellow mice. But this was not completely 

 proven in his article. 



EXPLANATION OF PLATE XII. 



Fig. 1. An adult mouse having self-coloured coat. 



Fig. 2. An adult mouse having spotted coat of recessive form. 



Fig. 3. An adult mouse of the " Daruma " race having dark spotted coat. It cannot be 



distinguished from the lightest spotted form of the " Kasuri " race as represented in 



Fig. 7, but revealed itself as having genetic composition of S'S'Dd by breeding test. 

 Fig. 4. The common types of the "Daruma" race. From the left to the right they 



represent, respectively, a pure white coated, a white coated having small spots around 



the ears, and a white coated having small spots in front of the tail. 

 Figs. 5 and 6. Two adult " Kasuri " mice having genetic composition of SSDd, one 



relatively light spotted, and another relatively dark spotted. 

 Figs. 7, 8, 9 and 10. A series of intensity of spotting in the " Kasuri " race having 



genetic composition of SS'Dd. 

 Fig, 11. A litter born in the mating 5 S'S'dd x ^ SS'Dd. From top to bottom they 



represent, respectively, a "Daruma," ditto, a "Kasuri," a spotted, a self, ditto. 



LITERATURE CITED. 



♦ 

 Bridges, C.B. 1916. "Non-disjunction as proof of the chromosome theory of 



heredity." Genetics, Vol. i. 

 Castle, W. E. 1905. " Heredity of coat characters in guinea-pigs and rabbits." 



Carnegie Institution of Washington, Publication No. 23. 

 and Little, C. C. 1910. " On a modified ratio among yellow mice." Science, 



N. S. Vol. XXXII. 



and Hadley, Philip B. 1915. "The English rabbit and the question of 



Mendelian unit-character constancy." Amer. Nat. Vol. XLix. 



Cu^NOT, L. 1905. " Les races pares et leurs combinaisons chez les souris (4'»e note), 



Arch. Zool. exp. et gen., 4'"e Serie, T. in., Notes et Revue. 

 Detlefsen, J. A. 1916. " Pink-eyed white mice carrying the color factor." Amer. 



Nat. Vol. L. 

 Dun, L. C. 1916. " The genetic behavior of mice of the color varieties ' Black- 



and-Tan ' and ' Red '." Amer. Nat. Vol. L. 

 Durham, F. M. 1908. " A preliminary account of the inheritance of coat-colour 



in mice." Rep. Evol. Comm. Rep. iv. 



1911. "Further experiments on the inheritance of coat colour in mice." 



Journal of Genetics, Vol. I. 



