ii DEVELOPMENT. 81 



his relations to the under-world of life; while that 

 which remains a dim suspicion for the unthinking, 

 hecomes a vast argument, fraught with the deep- 

 est consequences, for all who are acquainted with 

 the recent progress of the anatomical and physio- 

 logical sciences. 



I now propose briefly to unfold that argument, 

 and to set forth, in a form intelligible to those 

 who possess no special acquaintance with ana- 

 tomical science, the chief facts upon which all con- 

 clusions respecting the nature and the extent of 

 the bonds which connect man with the brute world 

 must be based: I shall then indicate the one im- 

 mediate conclusion which, in my judgment, is 

 justified by those facts, and I shall finally discuss 

 the bearing of that conclusion upon the hypoth- 

 eses which have been entertained respecting the 

 Origin of Man. 



The facts to which I would first direct the 

 reader's attention, though ignored by many of the 

 professed instructors of the public mind, are easy 

 of demonstration and are universally agreed to by 

 men of science; while their significance is so great, 

 that whoso has duly pondered over them will, I 

 think, find little to startle him in the other reve- 

 lations of Biology. I refer to those facts which 

 have been made known by the study of Develop- 

 ment. 



It is a truth of very wide, if not of universal, 

 170 



