76 TERTIARY SERIES. 
mations, will be made a subject of distinct 
inquiry, it will here suffice to state, that the 
proofs of method and design in the adaptation of 
these extinct forms of organization to the varied 
circumstances and conditions of the earth's pro- 
gressive stages of advancement, are similar to 
those we trace in the structure of living animal 
and vegetable bodies ; in each case, we argue 
that the existence of contrivances, adapted to 
produce definite and useful ends, implies the 
anterior existence and agency of creative intel- 
ligence. 
Chapter IX. 
Strata of the Tertiary Series. 
The Tertiary Series introduces a system of new 
phenomena, presenting formations in which the 
remains of animal and vegetable life approach 
gradually nearer to species of our own epoch. 
The most striking feature of these formations 
consists in the repeated alternations of marine 
deposits, with those of fresh water (see PI. ], 
sect. 25, 26, 27, 28). 
We are indebted to Cuvier and Brongniart, for 
the first detailed account of the nature and 
relations of a very important portion of the 
