species has spread from South America northward. I do not think so;
and the specimen thus obtained furnished a probable refutation of the
theory. It was a buck, and had just shed its small antlers. The
antlers are, therefore, shed at the same time as in the north, and it
appears that they are grown at the same time as in the north. Yet this
variety now dwells in the tropics south of the equator, where the
spring, and the breeding season for most birds, comes at the time of
the northern fall in September, October, and November. That the deer
is an intrusive immigrant, and that it has not yet been in South
America long enough to change its mating season in accordance with the
climate, as the birds--geologically doubtless very old residents--have
changed their breeding season, is rendered probable by the fact that
it conforms so exactly in the time of its antler growth to the
universal rule which obtains in the great arctogeal realm, where deer
of many species abound and where the fossil forms show that they have
long existed. The marsh-deer, which has diverged much further from the
northern type than this bush deer (its horns show a likeness to those
of a blacktail), often keeps its antlers until June or July, although
it begins to grow them again in August; however, too much stress must
not be laid on this fact, inasmuch as the wapiti and the cow caribou
both keep their antlers until spring. The specialization of the marsh-
deer, by the way, is further shown in its hoofs, which, thanks to its
semi-aquatic mode of life, have grown long, like those of such African
swamp antelopes as the lechwe and situtunga.

Miller, when we presented the monkeys to him, told us that the females
both of these monkeys and of the howlers themselves took care of the
young, the males not assisting them, and moreover that when the young
one was a male he had always found the mother keeping by herself, away
from the old males. On the other hand, among the marmosets he found