CiI AP. VIII. 
SEXUAL SELECTION. 
289 
Provided with horns, whilst in the greater number both 
8e xes have horns. With respect to the period of de- 
velopment, Mr. Blyth informs me that there lived 
a t one time in the Zoological Gardens a young koodoo 
(- Ant . strepsiceros), in which species the males alone 
ctl 'e horned, and the young of a closely-allied species, 
v iz. the eland (Ant. oreas), in which both sexes are 
Wned. Now in strict conformity with our rule, in the 
y°ung male koodoo, although arrived at the age of ten 
Months, the horns were remarkably small considering 
the size ultimately attained by them: whilst in the 
y°ung male eland, although only three months old, the 
Wns were already very much larger than in the koodoo, 
ft is also worth notice that in the prong-horned antelope , 23 
111 which species the horns, though present in both 
Se Xes, are almost rudimentary in the female, they do not 
a Ppear until about five or six months after birth. With 
s hoep, goats, and cattle, in which the horns are well 
'Weloped in both sexes, though not quite equal in size, 
tll ey can be felt, or even seen, at birth or soon after- 
wards . 20 Our rule, however, fails in regard to some 
^eeds of sheep, for instance merinos, in which the rams 
a l°ne are horned ; for I cannot find on enquiry , 27 that 
... 5 Antilocapra Americana. Owen, ‘Anatomy of Vertebrates, vol. 
Ul - P- G27. 
* I have been assured tbat the horns of the sheep in North Wales 
lu'. 1 a h'avs felt, and are sometimes even an inch in length, at birth. 
J ltl \ cattle Youatt says (‘ Cattle,’ 1834, p. 277) that the prominence of 
j 2 lr ontal hone penetrates the cutis at hirtb, and that the horny 
l 2 7er h soon formed over it. 
j i am greatly indebted to Prof. Victor Carus for having made 
^dairies for me, from the highest authorities, with respect to the 
r i' 10 sheep of Saxony. On the Guinea coast ot Africa there is a 
^ Of sheep in which, as with merinos, the rams alone bear horns; 
Vo VVinwuod Itcade informs me that in the one case observed, a 
tji 1Jn g ram born on Feb. 10th first showed boras on March 6th, so 
ut in this instance the development of the horns occurred at a later 
V °L. I. U 
