118 Mr. G. P. Mudge. On the Hereditary [ May 8, 
evidence shows that there are two pairs for each, 7.¢., presence and absence of 
greyness, presence and absence of blackness, presence and absence of selfness, 
and presence and absence of piebaldness. , 
13. Doncaster divided Crampe’s “ Irish” type into a and 6 sub-types (100). 
In this paper I propose a stricter definition of the “db” sub-type. 
REFERENCES. 
1, Allen, G. M.—“ Heredity of Coat Colour in Mice,” ‘Proc. Amer. Acad. Arts and 
Science,’ vol. 40, No. 2. 
2. Bateson, W., and Saunders, E. R.—‘ Experimental Studies in the Physiology of 
Heredity,” ‘Reports to Evolution Committee, Royal Society,’ Report I, 1901. 
3. Bateson, W., Saunders, E. R., and Punnett, R. C._—‘ Report to Evolution Committee, 
Royal Society,’ Report IT, 1905. 
4. Bateson, W., Saunders, E. R.,and Punnett, R. C.—‘ Report to Evolution Committee, 
Royal Society,’ Report III, 1906. 
5. Bateson, W.—“ The Present State of Knowledge of Colour-heredity in Mice and 
Rats,” ‘ Proc. Zool. Soc. London,’ 1903, vol. 2. 
54. Bateson, W.—“ The Progress of Genetics since the Rediscovery of Mendel’s Papers,” 
‘Progressus Rei Botanice,’ Erster Band, Jena. 
6. Castle, W. E.—“ Heredity of Coat Characters in Guinea-pigs and Rabbits,” Carnegie 
Institution of Washington, Publication No. 23, February, 1905. 
7. Castle, W. E., and Allen, G. M.—“ The Heredity of Albinism,” ‘Proc. Amer. Acad. 
Arts and Science,’ vol. 38. | 
8. Cotte, M. Jules.—“ Upon the Presence of Tyrosinase in Suberites domuncula, ‘Comp. 
Rend. Soc. de Biol.,’ Series IT, vol. 5, 19031904. 
9. Cuénot, M. L.— La loi de Mendel et Vhérédité de la pigmentation chez les souris,” 
‘Arch. Zool. Expér. et Gén.,’ Sér. 3, January 10; ‘ Notes et Revue,’ 1902. 
10. Cuénot, M. L.—“ L’hérédité de la pigmentation chez les souris” (2me note), ‘ Arch. 
Zoo]. Expér. et Gén.,’ Sér. 4, January 1; ‘ Notes et Revue,’ 1903. 
11. Cuénot, M. L.—“ L’hérédité de la pigmentation chez les souris” (83me note), ‘ Arch. 
Zool. Expér. et Gén.,’ Sér. 4, January 2 ; ‘ Notes et Revue,’ No. 3, 1904. 
12. Cuénot, M. L.— Hypothése de ’hérédité de la pigmentation entre le croisement des 
noirs, des gris, et des blanc souris,” ‘Comp. Rend. Soe. Biol.,’ 1903—1904, p. 301. 
13. Crampe.— Kreuzungen zwischen Wanderratten verschiedener Farbe,” ‘ Landwirth- 
schaftlichen Jahr.,’ vol. 6, 1877 ; zbid., vol. 12, 1883; zbed., vol. 138, 1884. 
14, Crampe.— Die Gesetze der Vererbung der Farbe,” ¢bzd., vol. 14, 1885. 
15. Doncaster, L.—‘‘ Inheritance of Coat Colour in Rats,’ ‘Proc. Camb. Phil. Soc.,’ 
vol. 13, Camb., 1906. 
16. Ducceschi.—‘ Rendicontti della R. Accad. dei Lincei,’ vol. 2 ; ‘ Archivio di Fisiologia,’ 
vol. 1. 
17. Durham, Florence M.-—“Tyrosinases in the Skins of Pigmented Vertebrates,” 
“Roy. soc. Proc? vol. 74. 
18. Furth v. Schneider.—‘ Beitr. z. Chem. Phys. u. Path.,’ vol. 1. 
19. Haacke, W.—“ Ueber Wesen, Urachen und Vererbung von Albinismus und 
Scheckung, etc.,” ‘ Biol. Centralbl.,’ vol. 15. 
20. Hurst, C. C.—“ Experimental Studies on Heredity in Rabbits,” ‘Journ. Lin. Soc. 
Zoo.,’ vol. 29. 
21. Lock, R. H.—‘‘‘ Ghost’ Maples in Peas,” ‘Roy. Soc. Proc.,’ vol. 79. 
