ORIGIN _OF SPECIES. tur 
thing can exist without a cause; and in a regular 
chain of intermediate causes, “nothing can exist but 
from a prior, and at length from the First.” 
The Earth could not exist without the Sun. The 
animal and vegetable kingdoms could not exist with- 
out the Earth. The Molusk and Articulate divi- 
sions could not exist without the Radiate, nor -the 
Vertebrate without the three prior types, as a house 
cannot be built without a foundation. 
~ Birds could not have existed without the Pteredac- 
tyli—the Cetacea without. the Ichthyosauri—the 
Horse without the Hipparion—Man without the Ape. 
It is true many of the prior links have become ex- 
tinct ; but they have served their uses, like the scaf- 
folding to a building, which is removed after the 
work is finished. 
This wonderful connection and inter-dependence 1s 
further proved by certain facts in embryology. The 
human embryo, commencing like every other, with a 
simple cell, is subject to a metamorphosis represent- 
ing the principal stages in the entire animal kingdom 
from lowest to highest. At any intermediate stage 
of creation, as when it had reached no higher than 
the fish, man could not have been created—at least, 
his creation then, would have been out of the estab- 
lished order. 
Lhird, There is a question of much importance 
touching the principal subject, about which there is 
a difference of opinion—that of Heredity, or, wheth- 
