426 NATURAL SCIENCE. *".^^'^- 



be taken in connection with the other evidence which has been sum- 

 marised in the 6th chapter of the writer's " Island Life," and also 

 with the admirable "Summary" of the purely physical argument in 

 the 2nd edition of Mr. O. Fisher's " Physics of the Earth's Crust." 

 It is certainly a remarkable fact that writers approaching the subject 

 from so many distinct points of view — as have Professor Dana, Mr. 

 Darwin, Sir Archibald Geikie, Dr. John Murray, Rev. O. Fisher, 

 and myself — should yet arrive at what is substantially an identical 

 conclusion ; and this must certainly be held to afford a strong 

 presumption that that conclusion is a correct one. 



Alfred Russel Wallace. 



