28 Result of Crossing Japanese Waltzing with Albino Mice 
due to my absence from Oxford for two months, and has given me assistance in 
tabulating the correlations. I owe thanks to Professor Pearson for giving aid 
in the calculation of the correlation coefficients, and in the criticism of some 
of the conclusions drawn from them. I am also very grateful to my friend 
Mr E. H. J. Schuster for much arithmetical help very generously given. Last, 
and almost, therefore, not least, to Mr Frank Sherlock I owe a debt of gratitude 
which is difficult to express. Mice are living things, and Mr Sherlock is almost 
entirely responsible for supplying them with their daily needs for more than a 
year with an industry and patience which is beyond all praise. The sanitary 
condition of a room containing some fifteen hundred mice is sufficient testimony 
to his conscientiousness and competence : he is in a way more directly responsible 
for the carrying out of the experiment than anyone else. For these things he 
merits my lasting gratitude, which is tendered to him in full measure. 
APPENDIX I. 
List of all Mice bred during the Experiment, with the Characters of their 
immediate Ancestors. 
Explanation of the Tables: — Every line of the table contains a single family; the columns 
on the left, nimibered 2 — 7, describe the characters of the ancestors. The notation used is nearly 
that of Mr Galton (see Biometrika, Vol. il. p. 237), and is shown by the following pedigree, in 
which every even number denotes a male, every odd number a female ancestor : 
Offspring 
2$ 3"? Parents 
4 5 5^$ Q$ 7"? Grandparents 
Every individual is described by a series of symbols denoting the amount of white fur in its coat, 
the nature of the colour in its coat, its eye-colour, and its power of waltzing. The following 
symbols are used : 
A = Albino ; in the columns recording ancestry, A alone means a pure-bred albino, while A x 
denotes a cross-bred albino (used only in recording ancestors), 
a = Yellow. 
h = Fawn colour. 
c = Wild-grey. 
c? = Dark wild-grey. 
e = Black. 
/= Lilac. 
g = Chocolate. 
a is used only of pure-bred waltzers with much white in the coat. 
^ is used only of pure-bred waltzers with less white in the coat than is signified by a. 
ir=A pure-bred waltzer, fawn and white, with pink eyes. 
w = A cross-bred with waltzing habit. 
p = With pink eyes. {Note that since all albinos and all the pure-bred waltzers used had pink 
eyes this symbol is omitted in describing pure-bred ancestors. When it is omitted in other 
cases, the individual referred to had dark eyes.) 
The figures, Nos. 1—6, denote amounts of white fur in the coat, as explained on p. 1. 
