26 THE HISTORY OF CREATION. 
tary organs, those exceedingly remarkable structures in 
animals and plants which have no object and refute every 
teleological explanation seeking for the final purpose of the 
organism. A great number of other phenomena might have 
been mentioned, which are no less important, and are ex- 
plained in the simplest manner by Darwin’s reformed 
Theory of Descent. For the present I will only mention 
the phenomena presented to us by the geographical distri- 
bution of animals and plants on the surface of our planet, 
as well as the geological distribution of the extinct and 
petrified organisms in the different strata of the earth’s 
crust. These important palzeontological and geographical 
phenomena, which were formerly only known to us as facts, 
are now traced to their active causes by the Theory of 
Descent. 
The same statement applies further to all the general laws 
of Comparative Anatomy, especially to the great law of 
division of labour or separation (polymorphism, or dif- 
ferentiation), a law which determines the form or structure 
of human society, as well as the organization of individual ~ 
animals and plants. It is this law which necessitates an 
ever increasing variety, as well as a progressive develop- 
ment of organic forms. This law of the division of labour 
has, up to the present time, been only recognized as a fact, 
and it, like the law of progressive development, or the law 
of progress which we perceive active everywhere in the 
history of nations (as also in that of animals and plants), is 
explained by Darwin’s Doctrine of Descent. Then, if we 
turn our attention to the great whole of organic nature, if 
we compare all the individual groups of phenomena of this 
immense domain of life, it cannot fail to appear, in the light 
