148 
PROFESSOR K. PEARSON AND DR. A. LEE ON 
Mr. G. U. Yule’s remarks on the association of temper and of artistic instinct in his 
memoir on “ Association,” ‘ Phil. Trans.,’ A, vol. 194, p. 290, 1900. 
Note II. On the Correlation of Fertility and Eye-Colour. —In the course of the 
present paper I have frequently referred to a probable influence of reproductive 
selection as the source of the progressive change in eye-colour, i.e., to a possibility that 
eye-colour is correlated with fertility. I saw from Mr. Galton’s tables that in 
many cases the whole family had not been recorded, probably the eye-colour of the 
dead or of absentees being unknown. It appeared to me accordingly that it would 
be impossible to deal directly with the problem of fertility. However, it has since 
occurred to me that there is nothing likely to give the missing members of families a 
bias towards one rather than another eye-colour, and that we may simply treat them 
as a purely random subtraction from the total results. Assuming this, Mr. L. N. 
Filon, M.A., has prepared for me tables of father’s and mother’s eye-colour and of 
the recorded number of their children. From these* I take first the following: 
results, premising (i.) that I call “ light eyed,” persons with eye-colours 1, 2 and 3, and 
“ dark eyed,” persons with eye-colours 4, 5, 6, 7, 8, i.e., drawing the line between light 
and dark grey ; (ii.) that I take as small families those with 0, 1, 2, or 3, recorded 
children and as large those with 4 or more recorded children. 
Fat her. 
Light Eyed. 
Dark Eyed. 
Totals. 
Small. 
313 
141 
1 
454 
Large. 
264 
139 
403 
1 
Totals 
577 
280 
857 
Mother 
Light Eyed. 
Dark Eyed. 1 
Totals. 
Small. 
253 
202 
455 
Large. 
225 
169 
394 
Totals 
478 
371 
849 
* Correlation tables were prepared of the size of families 0 to 15, and of the eye-colours 1 to 8, but it 
does not seem needful to print them in extenso. 
