154 On the Inheritance of the Mental and Moral Characters in Man 
of the inquiry. You have in Table I. (see p. 140) the mean of the resemblance in 
physical characters of brothers and sisters from my records of family measurements. 
You have in Table III. the mean of the physical measurements of our school 
records — 16 series in the first, 24 series in the latter. I venture to say that 
TABLE III. 
Inheritance of the Physical Characters. 
School Observations on Children. 
Character. 
Correlation. 
Brothers. 
Sisters. 
Brother and Sister. 
Health 
•52 
•51 
•57 
Eye Colour 
•54 
•52 
•53 
Hair „ 
•62 
•57 
•55 
Hair Curliness 
•50 
•52 
•62 
Cephalic Index 
•49 
•54 
•43 
Head Length ... 
•50 
•43 
•46 
Head Breadth... 
•59 
•62 
•54 
Head Height 
•55 
•52 
•49 
Mean 
•54 
•53 
•51 
Athletic Power 
•72 
•75 
•49 
remembering the possible slips in measurement and in classification, there is not 
the slightest doubt that those two series absolutely confirm each other, and give a 
mean degree of resemblance of nearly •S between children of the same parents 
for physical characters. How much of that physical resemblance is due to home 
environment ? You might at once assert that size of head and size of body are 
influenced by nurture, food, and exercise. It is quite true ; even curliness may be 
subject to home influences. But what is the broad effect of such environment on 
our coefficients of heredity ? Can any possible home influence be brought to bear 
on cephalic index, on hair colour, or eye colour ? I fancy not, and yet these 
characters are within broad lines inherited exactly like the characters directly 
capable of being influenced by nurture and exercise. I am compelled to conclude 
that the environmental influence on physical characters, however great in some 
cases, is not to the first approximation a great disturbing factor when we consider 
