Exhibition of Mendelian Experiments. 83 



The remaining- webbed, feet are bred from the mating 

 of a F.l. with the web-footed $ shown as a skin, or from 

 extracted web-footed pigeons mated together. 



Some normal feet are also shown in the bottle for com- 

 parison, including the feet of the Nun Pig-eon, used as the 

 normal -footed bird in the experiments. 



Skins Showing Birds Bred from Crosses between 

 Black Barb and White Fantail Pigeons. 



F.l. All birds are black with few white feathers. 

 (Skins i. and ii.) 



F.2. Blacks, whites, and homozygote "Blues. 11 (Skin vi.) 



Heterozygote "Blues. 11 (Skin v.) 



Blacks with few white feathers. (Skin iv.) 



A red, and some whites ticked with black or red also 

 produced. 



F.l. mated to White gives Black with few white feathers as 

 the heterozygote form (skin iii.), which when mated to 

 heterozygote "Blue 11 of F.2. gives Blacks, Whites, and 

 "Blues. 11 (Skinviii.) 



F.2. homozygote " Blue " mated to White gives " Blues " with 

 white feathers. 



F.2. heterozygote "Blue " mated to White gives Whites and 

 "Blues" with white feathers (skin vii.), which when mated 

 together give "Blue,' 1 "Blue' 1 with white, and White. 



F.2. homozygote "Blue" mated to F.2. heterozygote "Blue " 

 give equal numbers of "Blues," and " Blues " with white. 



The following specimens illustrating- some phases of 

 " Mendel's Law " were exhibited by W. Bateson, Esq. : — 



White Rose-comb Bantam. 



Note minute specks of pigment on breast. White breeds 

 having such specks when crossed with coloured birds give all 



