WHILE much has been done toward popular- 

 izing the subject of Evolution, whether in the way 

 of expounding the principles of the doctrine, or of 

 gathering in the proofs in favor of it, there has 

 not thus far appeared, to the knowledge of the 

 author, any collective or consecutive statement of 

 the evidence which geology and paleontology 

 present in support of organic transmutation. With 

 the view of partially filling this gap in the litera- 

 ture of Darwinism the author has prepared, at 

 the request of many of his friends, the following 



