XI PHENOMENA OF ORGANIC NATURE 357 



animal ]ife 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. 



