262 
SEXUAL selection: mammals. 
Part 1 
“ bitches both in weight and size. At birth, and f° r 
“ several weeks afterwards, a bitch-puppy will occS' 
“ sionallv be larger than any of the dogs, but they a*® 
“invariably beaten by them later.” Mr. McNeill? 
Oolinsay, concludes that “the males do not attain 
“ their lull growth till over two years old, though 
“the females attain it sooner.” According to 
Cupples’ experience, male dogs go on growing irl 
stature till they are from twelve to eighteen months 
old, and in weight till from eighteen to twenty-^ 1 ' 
months old ; whilst the females cease increasing ^ 
stature at the age of from nine to fourteen or fifte®® 
months, and in weight at the age of from twelve t0 
fifteen months. From these various statements if 
clear that the full difference in size between th® 
male and female Scotch deer-hound is not acqnir®^ 
until rather late in life. The males are almost exd 11 
sively used for coursing, for, as Mr. McNeill inforn ,s 
me, the females have not sufficient strength and weig 1 ^ 
to pull down a full-grown deer. From the names « se<1 
in old legends, it appears, as I hear from Mr. Cupp leS ’ 
that at a very ancient period the males were the m° st 
celebrated, the females being mentioned only as 
mothers of famous dogs. Hence during many genera 
tions, it is the male which has been chiefly test et 
for strength, size, speed, and courage, and the be® 
will have been bred from. As, however, the male® 
do not attain their full dimensions until a rath eI 
late period in life, they will have tended, in a< !' 
cordance with the law often indicated, to transit 
their characters to their male offspring alone; a 01 ' 
thus the great inequality in size between the se$ eS 
of the Scotch deer-hound may probably be account 
for. 
The males of some few quadrupeds possess organ* 
or 
