A. I). Dahbisiitrk 
21 
Waltzing is completely recessive to norma! walking, disappearing entirely in 
the hybrids resulting from the cross ; its coi relations with other characters, 
parental, grandparental or fraternal, arc always small and generally insensible. 
Except for the fact that the proportion of waltzers among the offspring of hybrids 
is so widely divergent from that indicated by the theory, waltzing is thus more 
nearly Mendelian in its behaviour than any of the characters examined. The 
distribution of waltzing individuals among the various families (see Table A) is, 
however, less regular than it should be. and in this way a sensible fraternal 
correlation is established (Table XIX.) which is not in accord with Mendelian 
theory. 
Hybrids crossed with Albinos. 
Unions between hybrids and albinos produced 746 young, of which 3G8 were 
albino, the rest being piebald or self-coloured. The gap between albinos and 
coloured individuals was wider than among the offspring of hybrids paired together, 
since the Group 1, including individuals in which the pigmented area is smallest, was 
entirely absent, and only eight individuals fell into the next group 2, the majority 
of individuals which were not albino being of degree 5 or 0. The coloured 
individuals had dark eyes, and none showed the waltzing habit. The range of 
coat-colours was less than among the offspring of hybrids paired together, since 
lilac did not occur. The relative frequency with which the different colours 
occurred was strikingly different from that seen among the offspring of hybrids, 
as Avill be gathered from the following table : 
Percentage frequenci/ of the Colours in (a) Coloured Offspring of Hybrids 
paired togetlter, (b) Coloured Offspring of Hybrids and Albinos. 
Colour 
Hybrid X Hybrid 
Hybrid x Albino 
a 
b 
c 
d 
f 
0 
7- 66 7„ 
22-97 7, 
.36-36 7, 
4-55 7„ 
18-66 7„ 
8- 37 7„ 
1-44 7„ 
6-08 7, 
3-17 7„ 
44-18 7, 
14-55 7„ 
29-10 7„ 
0-00 7„ 
2-90 7„ 
100-01 
99-99 
It will be seen that the coloured offspring of hybrids and albinos, which have 
more white in their ancestry than the offspring of hybrids alone, are characterised 
first by having considerably less white fur, and secondly by the greater frequency 
of wild-colour and black, as compared with yellow and fawn-colour — that is, 
by the presence of black pigment in larger quantity. This increase of blackness 
with increase in the number of albino ancestors is very remarkable, and no ex- 
planation suggests itself at present ; it is however in accord with the negative 
