EDITOR'S PREFACE. XVII 



included if revised by him at the present time. These must, therefore, be 

 accepted merely as reflecting his opinions at the time when they were writ- 

 ten, the editor not feeling himself at liberty to alter them, and thus perhaps 

 making Dr. Newberry appear to say what he might not have intended to 

 say. It contains so much of value, however, and its contents are referred 

 to so frequently, that the publication has become necessary both as a matter 

 of scientific record and for purposes of research. 



A. H. 



MON XXXV II 



