3 INTRODUCTION. 



marck long ago came to this conclusion, which has lately 

 been maintained by several eminent naturalists and 

 philosophers ; for instance by Wallace, Huxley, Lyell, 

 Vogt, Lubbock, Biichner, Kolle, &c.,' and especially by 

 Hackel. This last naturalist, besides his great work, 

 ' Generelle Morphologie ' (I860), has recently (1868, 

 with a second edit, in 1870), published his ' Natiirliche 

 Schopfungsgeschichte,' in which he fully discusses the 

 genealogy of man. If this work had appeared before 

 my essay had been written, I should probably never 

 have completed it. Almost all the conclusions at which 

 I have arrived 1 find confirmed by this naturalist, whose 

 knowledge on many points is much fuller than mine. 

 Wherever I have added any fact or view from Prof. 

 Hackel's writings, I give his authority in the text, other 

 statements I leave as they originally stood in my manu- 

 script, occasionally giving in the foot-notes references 

 to his works, as a confirmation of the more doubtful or 

 interesting points. 



During many years it has seemed to me highly pro- 

 bable that sexual selection has played an important 

 part in differentiating the races of man; but in my 



1 As the works of the first-named authors are so well known, I need 

 not give the titles ; but as those of the latter are less well known in 

 England, I will give them : — ' Sechs Vorlesungen iiber die Darwin'- 

 sche Theorie:' zweite Auflage, 1868, von Dr. L. Biichner ; translated 

 into French under the title ' Conferences sur la Theorie Darwinienne,' 

 1869. ' Der Mensch,, im Lichte der Darwin'sche Lehre,' 1865, von 

 Dr. F. Kolle, I will not attempt to give references to all the authors 

 who have taken the same side of the question. Thus G. Canestrini 

 has published ('Annuario della Soc. d. Nat.,' Modena, 1867, p. 81) a 

 very carious paper on rudimentary characters, as bearing on the origin 

 of man. Another work has (1869) been published by Dr. Barrage. 

 Francesco, bearing in Italian the title of " Man, made in the imaee of 

 God, was also made in the image of the ape." 



