146 Book Notices. 
Rocky Mountains. The evidence goes even further; each of these suc- 
cessive sets of beds of the Silurian system contains peculiar fossils, nei- 
ther found in the beds above nor in the beds below, and between them 
there are no intermediate forms. And yet Darwin affirms that “ the lit- 
toral and sub-littoral deposits are continually worn away, as soon as they 
animals are the product of gradual improvement, when eyes as perfect as 
those of the Trilobites are preserved with the remains of these oldest 
acquire their instincts gradually; when even those that never see theit 
parents, perform at bir 
age eminently characterized for its industry, and during which, that 
information was laboriously accumulated by crowds of faithful laborers. 
pee 
ings, and unaccountable on any other basis than that they owe = 
existence to the working of intelligence ; and no theory that overloo 
this element can be true to nature, 
T 
