758 CLASS XVIT. 



As man, in a greater degree than any other creature, ia dispersed 

 over the whole globe, there are numerous varieties also of the human genua 

 which, at least in part, may be explained as the effect of climate and mode 

 of life. The difference in different races of people has chiefly reference to 

 the form of the skull, to the colour and the kind of hair. The five races 

 of Blumenbach {Varietas caucasia, mongolica, celhiopica, americana, et 

 malaica) do not include all these modifications. Natural history affords, in 

 our judgment, no foundation for the adoption of different human species; 

 another question of an historical nature, whether all men have spread over 

 the earth from a single point and from a single ancestral pair, is beyond 

 its province, and it can only offer a judgment as to the greater or less 

 probability of such an origin. 



Man appeared upon the surface of the earth at a later period than 

 the animal species of which the remains are met with in the tertiary 

 deposits. 



Compare on the natural history of man, amongst others, J. F. Blumen- 

 bach De generis huniani varietate nativa, ed. 3 (ultima), Gottingse, 1795, 

 8vo; — Ejusd. Decades craniorum diversarum gentmm yi. Gottingse, 1790 — 

 1820; Nova Pentas Collectionis suce craniwum, ibid. 1828. — Stanhope 

 Smith Essay on the causes of the variety of complexion and figure in the 

 Human Species, Philadeljoliia, reprinted Edinburgh, 1 788, 8vo ;• — G. F. LuD- 

 wiG Grundriss der Naturgeschichte der Menschenspecies, Leipzig, 1796, 8vo; 

 • — Prichard Researches into the Physical History of Manhind, 4 Vols, with 

 engravings, London, 1841, 8vo (3d. ed.); J. C. NoTT and G. E. Gliddon 

 Types of Mankind, or Ethnological Researches, illustrated hy selections from, 

 the inedited papers of &. G. Morton, London, 1854, 4to. 



