16 Df Vi Physica 



not expressly acknowledged the filiation in 

 the dedication to the most popular and most 

 attractive of his works. " To Charles Lyell, 

 "Esq., this edition is dedicated with grate- 

 " ful pleasure, as an acknowledgment that 

 " the chief part of whatever scientific merit 

 " this Journal and the other works of the 

 " author may possess, has been derived from 

 " studying the well known and admirable 

 " Principles of Geology" It was to harmonise 

 with Lyellian principles of Geology that 

 Darwin invented, not only his famous theory 

 of the Origin of Species, but also the less 

 known, but not less noteworthy theory of 

 the origin of Coral Reefs. Darwin builds on 

 Lyell, and they stand or fall together : an 

 interdependence not sufficiently understood. 

 It deserves, further, to be noticed, that few 

 things ever gave Lyell more pleasure than 

 Darwin's theory as to the origin of Coral 

 Reefs. "On receiving from its author a 



