°HAP. VIII. 
SEXUAL SELECTION. 
275 
i®d to tlie mueli more frequent development of secon- 
dary sexual characters in the male than in the female, 
dint the development of such characters will have been 
much aided, if the conclusion at which I arrived after 
Undying domesticated animals, can be trusted, namely, 
that the male is more liable to vary than the female, 
d am aware how difficult it is to verify a conclusion of 
this kind. Some slight evidence, however, can be gained 
V comparing the two sexes in mankind, as man has 
deen more carefully observed than any other animal, 
during the Novara Expedition 15 a vast number of mea- 
s, U'ements of various parts of the body in different races 
"’ere made, and the men were found in almost every 
°ase to present a greater range of variation than the 
"’omen; but I shall have to recur to this subject in 
a future chapter. Mr. J. Wood, 10 who has carefully 
^tended to the variation of the muscles in man, puts 
111 italics the conclusion that “ the greatest number of 
abnormalities in each subject is found in the males.” 
J de had previously remarked that “altogether in 102 
subjects the varieties of redundancy were found to 
, £ de half as many again as in females, contrasting 
" widely with the greater frequency of deficiency in 
“ females before described.” Professor Macalister like- 
wise remarks 17 that variations in the muscles “are 
Probably more common in males than females.” 
Certain muscles which are not normally present in man- 
v iud are also more frequently developed in the male 
t dan in the female sex, although exceptions to this rule 
1,1 ‘Reise der Novara: Antbropolog. Tkeil,’ 1807, s. 216-269. The 
j? su lts were calculated by Dr. Weisbaoh from measurements made by 
.! R. Sckerzcr and Schwarz. On the greater variability of the males 
1 domesticated animals, see my ‘ Variation of Animals and Plants 
V r domestication,’ vol. ii. 1S68, p. 75. 
1? ‘Proceedings Royal Soe.’ vol. xvi. July, 1868, p. 519 and 52-1. 
1 Rroc. Royal Irish Academy,’ vol. x. 18G8, p. 123. 
T 2 
