1903.] IN FANCY MICE AND RATS. 83 



We may next consider the fui'ther evidence regarding mice. 

 By the great kindness of Mr. F. G. Parsons, I am permitted to 

 include in this paper notes of 50 matings made by Mr. Parsons in 

 conjunction with Dr. S. M. Oopeman. These experiments were 

 made with other objects in view and are still in progress, but as 

 they stand they are a valuable contribution to the question of the 

 inheritance of colour. The notes which Mr. Parsons has placed 

 at my disposal are here given exactly as they were received. I 

 have merely inserted the letters DR and DD according as the 

 results show that the individual in question was a heterozygote 

 containing albino, or that it was free from, the albino chai-acter. 

 Those not thus distinguished cannot be discriminated by the 

 existing evidence. 



The following abbreviations are used : bl., black ; br., brown 

 = chocolate; Mw., pied-black ; 5rto., pied-brown ; tw., albino. 



Experiments made by Mr. 



Mating. 



(1) w.$A X blw.<Ja(DR) 



(2) „ Xw.<?i3 



(3) „ X brw. ^ (BXa)(DR) 



(4) vv.?B Xblw.<?a (DR) 



(5) „ XW.S0 



(6) „ X brw.<?7(Bxa)(DR) 



(7) „ X 



(8) blw. ? C (? DD) X blw. c? a (DR) 



(9) „ XW.SI3 



(10)w.?D Xblw.(?a(DR) 



(11) „ Xw.c?/3 



(12) „ Xbrw.<?7(BXa)(DR) 



(13) „ X 



(14) „ X bl\v.c?a(DR) 



(15) w.?E X bhv.c?a(DR) 



(16) w.?F Xblw.<?a(DR) 



(17) „ Xw.<?0 



(18)\v.?Bi(BXa) Xblvv.(?a(DR) 



(19) w.$B2(Bxa) X 



(20) „ Xw.(?e 



(21) w. ? B3 (B X «) X blw. (? a (DR) 



(22) „ X w.(Je 



(23) „ X blw.C2-i(C-Xa)(DR) 



(24) blw. ? Ci (C X a)(? DD) X blw. S « (DR) 



(25) „ X w.c?6 



(26) brw. ? C2(C X a) (DR) X blw. t? a (DR) 



(27) ,, X 



(28) „ Xw.(?e 



(29) „ Xbnv.t?C2-2(DD) 



(30) „ X „ 



(31) „ X 



(32) bl.?Di(DXa)(DK) X blw.c?a(DR) 



(33) ., Xblw.JC2-i(DR)(C-Xa 



6* 



