180 THE GEOLOGICAL SUCCESSION, ETC. 



attempt the study of those that are more complicated. The 

 development of the simple before the complex, appears to 

 have ever been the plan of nature, whether her operations 

 be traced in time or through the dark geological periods of 

 the past; and whether we contemplate the successive phases 

 through which life has already passed, or the organic phe- 

 nomena of the present living races of plants and animals, 

 we see everywhere evidence of the immutability of nature, 

 and the uniformity of her organic laws. 



THE END. 



