C «AP. XVIII. 
DEVELOPMENT OP HAIR. 
281 
Auction, He gives, however, only a conjectural and 
unsatisfactory explanation of its use. 13 
In most cases, when during the breeding-season the 
Unile alone emits a strong odour, this probably serves 
t: ° excite or allure the female. We must not judge 
°n this head by our own taste, for it is well known 
that rats are enticed by certain essential oils, and 
c ats by valerian, substances which are far from agree- 
a ble to us ; and that dogs, though they will not eat 
carrion, sniff and roll in it. From the reasons given 
"’hen discussing the voice of the stag, we may reject 
the idea that the odour serves to bring the females 
from a distance to the males. Active and long-continued 
cannot here have come into play, as in the case ot 
the vocal organs. The odour emitted must be ol con- 
siderable importance to the male, inasmuch as large 
a nd complex glands, furnished with muscles for evert- 
h'g the sack, and for closing or opening the orifice, 
have in some cases been developed. 1 he development 
cf these organs is intelligible through sexual selection, 
fr the more odoriferous males are the most successful in 
"'inning the females, and in leaving offspring to inherit 
their gradually-perfected glands and odours. 
Development of the Hair . — We have seen that male 
Quadrupeds often have the hair on their necks and 
shoulders much more developed than in the females ; 
a nd many additional instances could be given. This 
s °metimes serves as a defence to the male during his 
battles; but whether the hair in most cases has been 
R Pecially developed for this purpose is very doubtful. 
W e may feel almost certain that this is not the case. 
( 12 Pallas, ‘ Spicilegia Zoolog.’ fasc. xiii. 1799, p. .24 ; Desmoulins, 
* Diet. Class. d’Hist. Nat.’ tom. iii. p. 586. 
