MENDEL'S LAW AND THE HEREDITY OF ALBINISM. 397 



plete latency. When bred to other albinos they uniformly produce albinos, hence 

 they may for convenience be distinguished as impure recessives. In guinea-pigs 

 and rabbits the impurity of recessive individuals is, in certain cases at least, visible; 

 in mice it apparently is not. 



8. Cross-breeding is able to bring into activity latent characters or latent elements 

 of a complex character. This is probably the true explanation of many cases of 

 reversion. Conversely, it is able to cause one or another element of a complex 

 character to become latent and to remain so under close breeding. This principle 

 probably explains how races of black or yellow mice may be obtained by crossing 

 wild gray mice with albinos. 



9. The Mendelian doctrine of gametic purity is fully substantiated by experi- 

 ments in breeding mice, guinea-pigs, and rabbits, but with the important qualification 

 stated under 8, a qualification which really enhances the practical utility of that 

 doctrine in its every-day application by breeders. 



IX. BIBLIOGRAPHY. 



Bateson, W. 



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Hybridisation. Cambridge, Eng., 16, xiv+212 pp. 

 Bateson, W., and Saunders, E. R. 



:02. Experimental Studies on the Physiology of Heredity. Reports to the Evolution Committee of the 



Royal Society. Report I. 160 pp. London. 

 Castle, W. E. 



:03. Note on Mr. Farabee's Observations [on Negro Albinism]. Science, n. ser., vol. 17, no. 419, pp. 75-76. 

 Castle, W. E. 



:03 a . Mendel's Law of Heredity. Proc. Amer. Acad. Arts and Sci., vol. 38, no. 18, pp. 535-548. 

 Castle, W. E., and Allen, G. M. 



:03. The Heredity of Albinism. Proc. Amer. Acad. Arts and Sci., vol. 38, no. 21, pp. 603-622. 



Correns, C. 



:03. Ueber Bastardirungsversuche mit Mirabilis-Sippen. Erste Mittheilung. Ber. Deutsch. Bot. Gesell. 

 Bd. 20, Heft 10, pp. 594-608. 



Crampe, [H.] 



'85. Die Gesetze der Vererbung der Farbe. Landwirtsch. Jahrbiicher, Bd. 14, Heft 4, pp. 539-619. 



Cue"not, L. 



:02. La loi de Mendel et 1'he're'dite' de la pigmentation chez les souris. C. R. Acad. Sci., Paris, torn. 134, pp.; 

 779-781. 



Darbishire, A. D. 



:02. Notes on the Results of Crossing Japanese Waltzing Mice with European Albino Races. Biometrika, 

 vol. 2, pt. 1, pp. 101-104. 



Darbishire, A. D. 



:03. Second Report on the Results of Crossing Japanese Waltzing Mice with European Albino Races. 

 Biometrika, vol. 2, pt. 2, pp. 165-173. 



