c hap. IV. 
MANNER OF DEVELOPMENT. 
127 
The males alone of the anthropomorphous apes have 
their canines fully developed ; but in the female gorilla, 
a nd in a less degree in the female orang, these teeth 
Project considerably beyond, the others; therefore the 
tact that women sometimes have, as I have been assured, 
considerably projecting canines, is no serious objection 
to the belief that their occasional great development in 
'can is a case of reversion to an ape-like progenitor. 
He who rejects with scorn the belief that the shape of 
bis own canines, and their occasional great development 
in other men, are due to our early progenitors having 
been provided with these formidable weapons, will pro- 
bably reveal by sneering the line of his descent. For 
though he no longer intends, nor lias the power, to use 
these teeth as weapons, he will unconsciously retract his 
snarling muscles” (thus named by Sir 0. Bell) 43 so as 
t° expose them ready for action, like a dog prepared to 
fight. 
Many muscles are occasionally developed in man, 
' v hich are proper to the Quadrumana or other mam- 
mals. Professor Vlacovich 44 examined forty male sub- 
lets, and found a muscle, called by him the ischio- 
Pubie, in nineteen of them ; in three others there was 
a ligament which represented this muscle ; and in the 
Remaining eighteen no trace of it. Out of thirty female 
subjects this muscle was developed on both sides in only 
tw °, but in three others the rudimentary ligament was 
Present. This muscle, therefore, appears to be much 
1110 1- e common iu the male than in the leiuale sex ; and 
°u the principle of the descent of man lrom some lower 
i°rm, its presence can be understood ; for it has been 
detected iu several of the lower animals, and iu all of 
‘Tte Anatomy of Expression,’ 1844, p. 110, 131. 
Quoted by Prof. Canestrini in the 1 Annuario,’ &c., 1 8G7, p. 90. 
