A. R. Galloway 
29 
(iii) Inheritance of Eye Colour. I now pass to my matings bearing on pink 
and dark eyes. The matiags are [all tabled in Appendix B, and the table below 
gives a summary of the results reached. 
The possible matings are as follows : 
I. Pure Pink-eyed </ x pure Dark-eyed $ . 
II. Pink-eyed x Pink-eyed $ . 
III. Pure Dark-eyed (/" x Pink-eyed $ . 
III. 1. Dark-eyed </ x Pink-eyed $ from Pink-eyed Father and Dark-eyed 
Mother. 
III. 2. Dark-eyed from Pink-eyed Father x Pink-eyed ? . 
III. 3. Dark-eyed from Pink-eyed Mother x Pink-eyed ? . 
III. 4. Dark-eyed </ from Pink-eyed Father x Pink-eyed ? from Pink-eyed _ 
Father and Dark-eyed Mothei-. 
III. 5. Dark-eyed </ from Pink-eyed Mother x Pink-eyed $ from Pink-eyed 
Father and Dark-eyed Mother. 
IV. Dark-eyed </ x Dark-eyed $ , both pure. 
IV. 1. Dark-eyed cT x Dark-eyed $ from Pink-eyed Mother. 
IV. 2. Dark-eyed J' from Pink-eyed Mother x Dark-eyed $ from Pink-eyed 
Mother. 
IV. 3. Dark-eyed </ from Pink-eyed Father x Dark-eyed $ (pure). 
IV. 4. Dark-eyed J' from Pink-eyed Mother x Dark-eyed $ (pure). 
Now according to the view of Bateson and Punnet every pink-eyed female is 
alike in gametic character, and every dark-eyed female is also alike. The dark- 
eyed male may, however, be homozygous or heterozygous in eye colour. Thus 
there is no distinction between a dark-eyed female of dark-eyed descent, and one 
which has arisen from a pink-eyed ancestry by one dark-eyed cross. Unfortunately 
the data are not sufficiently numerous, and the knowledge of sex is so incomplete 
in the case of the offspring that it is not possible to test effectively some of the 
fundamental points of this theory which depends on the hypotheses that (a) sex is 
heterozygous in the female and {b) that there is a repulsion between femaleness 
and dark-eyedness. 
Thus whether a dark-eyed female comes from a dark-eyed line or not, her 
gametic constitution is represented by p.d. J' % and her ova are p. $ and d. but 
a dark-eyed male may be either d.d.J'J', the homozygous type, or p.d.J^f^, the 
heterozygous type, the gametes being d. d. ^ and p. ^ , d. </ respectively. It is 
perfectly easy to deduce from this the expected proportions of offspring both as to 
sex and eye colour. But the numbers, especially those sexed, in the subclasses 
III. 1 — 5, and IV. 1 — 4, are quite insufficient to draw conclusions as to the 
fundamental hypotheses. Such conclusions, however, as can be drawn are at no 
point opposed to the theory above developed. 
