yi PKEFACE. 



differed from its predecessor ; but I shall not attempt to offer 

 the reader such a summary in the present case, fearing that 

 that would prove tediously long.* 



A full index is given in this as in former editions, and 

 the student will observe that all the organic remains of which 

 there are woodcut figures in the text are printed in italics 

 in the index. 



CHAELES LYELL. 



53 Harley Street, London, 

 December 20, 1864. 



* As it is impossible to enable the reader to recognize rocks and minerals at 

 sight by aid of verbal descriptions or figures, he will do well to obtain a well- 

 arranged collection of specimens, such as may be procured from Mr. Tennant 

 (149 Strand), teacher of Mineralogy at King's College, London. 



