TT 



LIFE'S DAWN ON EARTH 



BlilNG THE 



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THEIR RELATIONS TO GEOLOGICAL TIME 



AND TO THE DEVELOPMENT OF 



THE ANIMAL KINGDOM. 



J. W. DAWSON, LL.D., F.R.S., F.G.S., Etc., 



PRINCIPAL AND VICE-CHANCELLOR OF M'GILL UNIVERSITY, MONTREAL ; 



AUTHOR OF 

 ARCHAIA," "ACADIAN GEOLOGY," "THE STORY OF 

 THE EARTH AND MAN," ETC. 



SECOND THOUSAND. 



LONDON : ^ 



HODDER & STOUGHTON, 

 27, PATERNOSTER ROW. 



MDCCCLXXV. 



