PREFACE. 



TN this book I present to the public some essays 

 -*- on Pre-historic Archaeology, part of which have 

 appeared in the " Natural History Keview/' viz., 

 that on 



The Danish Shell-mounds, in October, 1861. 



The Swiss Lake-dwellings, in January, 1862. 



The Flint Implements of the Drift, in July, 1862. 



North American Archaeology, in January, 1863. 



Cave-men, in July, 1864. 



Messrs. Williams and Norgate suggested to me to 

 republish these articles in a separate form, and I was 

 further encouraged to do so, by the fact that most of 

 them had re-appeared, either in France or America. 

 The conductors of the " Annales des Sciences Na- 

 turelles " did me the honor to translate those on the 

 Danish Shell-mounds, and the Swiss Lake-dwellings. 

 The latter also appeared in "Silliman's Journal;" and 

 the article on American Archaeology, with the excep- 

 tion of the last paragraph, was reprinted in the " Smith- 

 sonian Eeport, for 1862." 



