ON HEBEDITY IK liABBITS. Sl9 



Experimeuts liave not yet been carried out to test whether 

 ■certain albinos carry grey only. 



Self-colour and Dutch marJcings. — Albinos extracted from self- 

 coloured parents appear to carry the latent factor for self -colour 

 only, while albinos extracted from marked hybrids containing 

 the self and Dutch factors appear to be of two kinds, viz. : — 

 albinos carrying self-colour, and albinos carrying self and 

 Dutch. 



Experiments have not yet been carried out to test whether 

 extracted albinos carry Dutch only. 



Pure-bred albinos with all albino ancestors for at least eight 

 generations, and probably many more, so far appear to be of the 

 three kinds?, viz. : — albinos carrying self only, albinos carrying 

 Dutch only, and albinos carrying both self and Dutch. All these 

 latent factors for coat-colour and coat-pattern apparently carried 

 by albinos do not become patent until the albino is bred with a 

 normal or coloured form, presumably because they are incom- 

 patible with albinism. Nevertheless, in their latency, they 

 appear to segregate gametically in albino matings as in normal 

 matings, following the ordinary Mendelian rules of segregation 

 and gametic purity. 



These results confirm, and extend to rabbits, results already 

 obtained by Prof. Cuenot in mice, though it would appear that 

 the heredity of Dutch markings in rabbits differs in some respects 

 Ironi that of the " panachure " in mice. 



Jfendelian Analysis of individual liahhits tised in 

 the JExperiments. 



The following table gives a list of 45 individual rabbits that 

 have been analysed in these experiments in accordance with the 

 Mendelian principles. Eirst is given tlie Stud JSTo. of the 

 individual, the sex, the parentage, and the somatic characters 

 somewhat abbreviated. Underneath is given the gametic cou- 

 stitution of the individual as determined in these experiments, 

 the gametic factors being expressed in the same terms as the 

 somatic characters above. 



