ON HEEEDITY IN IIABBITS. 31& 



SO far as tested, appear to carry the self factor only, for mated 

 witli pure selfs they gave 16 young, all selfs, and mated with 

 j)ure Dutch they gave 6 young, all slightly marked. 



In the marked line, No. 39, extracted albino, appears to carry 

 the self factor only, for mated with a pure Dutch it gave 10 

 young, all slightly marked ; while the 2 extracted albinos, Nos. 15 

 and 16, appear to carry both the self and Dutch factors, for- 

 mated with pure selfs they gave 7 selfs and 3 slightly marked, 

 and mated with pure Dutch they gave 10 Dutch and 9 marked. 



So far as they go, therefore, the above results point to the 

 following conclusions : — 



(1) That both pure-bred and extracted albinos may carry the 

 factors for self-colour and Dutch markings. 



(2) Some of the albinos carry the self factor, others the 

 Dutch factor only, and others, again, both the self and Dutch 

 factors. 



(3) The factors for coat-pattern remain latent when albinos 

 are mated together, but become patent when the albinos are 

 mated with normal individualt^. 



(4) The coat-pattern characters — unlike the previous cha- 

 racters dealt with — are neither dominant nor recessive towards 

 one another, but when crossed give intermediate hybrids in the 

 first generation. In the second and third generations, however, 

 these characters appear to follow the ordinary Mendelian rules 

 of segregation and gametic purity. 



(5) The Dutch markings, which made their appearance in the 

 second generation of the Belgian- Angora cross, appear to have 

 been introduced by one of the albino Angoras (No. 3) and not 

 the other (No. 2). 



(6) The Dutch-marked rabbit would appear, therefore, to be 

 a distinct mutation, rather than a partial albino caused by im- 

 perfect segregation. Similarly, the slightly marked forms are to 

 be regarded as variable hybrids between the Dutch-marked and the 

 self-coloured, rather than the result of varying imperfections of 

 segregation from albinism. 



These conclusions, arrived at from experiments with Eabbits, 

 in some respects appear to be similar to those already ob- 

 tained by Prof. Cuenot with Mice, while in other respects they 

 seem to differ. Both results are in agreement so far, that the 

 " panachure " in mice and the Dutch markings in rabbits are unit 

 characters in heredity following the ordinary Mendelian rules of 



