12 Results of Crossing Grey {House) Mice with Albinos 
Cross M. Pairs made of Coloured Offspring of E pairs ivhich have 
given some White Young when Grossed with White. 
Kesults 
Eesults 
M 1 
3 A, 3SY 
Mil 
\A, \G 
M 2 
IGA, 2G, IGP 
M12 
2A, 2G 
M 3 
3A, IGP, 2G 
MIS 
bG 
M Jt 
I A, QG 
MlJf 
lA, 4B, 2G 
M 5 
3A, 3G 
M15 
lA, IB, 3G 
M 6 
2A, 2G, IB 
M 16 
bG 
M 7 
2A, 3G 
M17 
lA, 2G 
M 8 
2A, 2GP, \G 
M 18 
3G 
M 9 
\A, 5(?, \GP 
M21 
lA, 36', l^ST 
MIO 
3 A, 2SY, \G 
M 20* 
3A, IB, \G 
Total 
30^, b2G, hGP, IB, IGA, QSY. 
APPENDIX II. (See p. 3.) 
The eight pure mice would have the following gametic formulae GGU, CGP, 
GYU, GYP, AGU, AGP, AYU, AYP. The last four being white, and the first 
four coloured respectively, uniform grey, piebald grey, uniform yellow and piebald 
yellow. Of the 56 hybrids, there are 24 which are hybrids with regard to only 
one pair of characters; — two of each of the following 12 different kinds: GGU-CGP, 
GGU- AGU, uniform grey in colour; CGU-CYU, CYU-GYP, GYU- AYU, uniform 
yellow; CGP- AGP, piebald grey; GGP-GYP, GYP- AYP, piebald yellow; 
AGU-AGP, AGU-AYU, AGP-AYP, AYU-AYP, albino. There are 24 which 
are hybrids with regard to two pairs of characters, 4 of each of the following six 
different kinds, GGU-GYP, AYU-GGU, AYP-CYU, uniform yellow; AGP-CGP, 
uniform grey; AYP-CGP, piebald yellow; AGU-AYP, albino. Also 8 hybrids 
with regard to all three pairs of characters ; of these there can be only one kind, 
which is uniform yellow in colour. 
