MATHEMATICAL CONTRIBUTIONS TO THE THEORY OF EVOLUTION. 
147 
[Notes added July 3, 1900. 
Note I. Inheritance of Temper and Artistic Instinct .—In additional to the fraternal 
correlations given on p. 102, I have dealt with Mr. Galton’s statistics for the inheri¬ 
tance of good and bad temper given in his ‘ Natural Inheritance ’ (p. 235). The 
following gives the distribution of good and bad temper among 1,294 brethren, as 
deduced by Mr. Yule. 
First Brother. 
Good Temper. 
Bad Temper. 
Totals. 
Good 
temper. 
330 
255 
585 
Bad 
temper. 
255 
454 
709 
Totals 
585 
709 
1294 
The correlation is '3167. 
A like table is that for artistic instinct in the direct line :— 
Parentage. 
Artistic. 
Non-artistic. 
Totals. 
6 
. ^ 
296 
173 
469 
-5 
O 
Non 
artist 
372 
666 
1038 
Totals 
668 
839 
1507 
In this case the correlation is '4039. 
The fraternal correlation is somewhat low. The exact significance of the parental 
correlation is also somewhat vague, as the parentage is classified as artistic when 
one or both parents are artistic. But the two tables are very suggestive, they 
indicate how the new method will enable us to deal quantitatively even with 
characters like temper and artistic instinct to which it is impossible to apply directly 
a quantitative scale. With the introduction of a third or medium class, I believe it 
will be possible to obtain excellent results for heredity from very simple observations, 
and I have in hand at the present time a large series of observations on collateral 
heredity based upon such simple classifications. The reader should further consult 
u 2 
