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XI PHENOMENA OF ORGANIC NATURE 357 
~ animal life and vegetable life which I should meet 
_ with in the successive beds would, looking at them 
_ broadly, be the more different the further that I 
went down. Or, in other words, inasmuch as we 
started with the clear principle, that in a series of 
naturally-disposed mud beds the lowest are the 
oldest, we should come to this result, that the 
further we go back in time the more difference 
exists between the animal and vegetable life of 
an epoch and that which now exists. That was 
the conclusion to which I wished to bring you at 
the end of this lecture. 
i i a a a 
Sees ; 
