158 EVOLUTION OF EIFE. 
being half Hare half Rabbit. According to Prof. Haeckel, 
the pairing of the male Goat and female Sheep is very 
common in Chili, their progeny being fertile; while the Ram 
and female Goat rarely pair, and then without offspring. It 
is well known that some animals when confined in menage- 
ries, etc. will not breed. We see, therefore, upon what slight 
differences reproduction depends. 
The absence of links between the different forms of plants 
and animals is often urged as an objection to the theory of the 
Evolution of Life. The not finding of links is due very often 
to not looking for them in the right place. Thus, a pigeon- 
fancier, not finding a link between the Carrier and Pouter, 
might have argued some years ago that they had descended 
from the primitive Carrier and Pouter, of whose origin he 
knew nothing. Butitis well known now that these pigeons 
are the posterity of a common ancestor, the Rock Pigeon. 
Hence the transitional forms are between the Rock Pigeon 
and the Carrier, between the Rock and the Pouter. We 
have tried to show that the Struggle for Existence pro- 
duces a divergence of character, so that in the course of 
time the posterity differs greatly from the parent stock. 
Now, if the intermediate animals die out, forms are left 
which have little in common with existing animals. In 
this manner may be explained the existence of such isolated 
unique forms as the Elephant, Sloth, Giraffe, so readily 
distinguished by their striking peculiarities. The Capu- 
chins, among the South American monkeys, on the con- 
trary, exhibit such a number of varieties, species, and genera 
that it is almost impossible to classify them, the transitional 
forms being so numerous. Many have argued that too 
much time is required in the development of the animal 
and vegetal kingdoms through the Survival of the Fittest. 
Physical and Geological science cannot at present assign 
any definite age to the Earth; and, from the rate at which 
deposits are formed at the present day, millions and mil- 
action ( 
Usually 
Kamp] 
