xxiv MAN AND THE GLACIAL PERIOD. 



of Birmingham, England, and to Mr. G. W. Lamplugh, of 

 Bridlington, as well as to Mr. C. E. De Eance and Mr. 

 Clement Eeid, of the British Geological Survey, besides 

 many others in England who have facilitated my investi- 

 gations ; but pre-eminently to Prof. Percy F. Kendall, of 

 Stockport, who consented to prepare for me the portion 

 of Chapter VI which relates to the glacial phenomena 

 of the British Isles. I have no doubt of the general cor- 

 rectness of the views maintained by him, and little doubt, 

 also, that his clear and forcible presentation of the facts 

 will bring about what is scarcely less than a revolution in 

 the views generally prevalent relating to the subject of 

 which he treats. 



For the glacial facts relating to France and Switzer- 

 land I am indebted largely to M. Falsan's valuable com- 

 pendium, La Periode Glaciaire. 



It goes without saying, also, that I am under the deep- 

 est obligation to the works of Prof. James Geikie upon 

 The Great Ice Age and upon Prehistoric Europe, and to 

 the remarkable volume of the late Mr. James Croll upon 

 Climate and Time, as well as to the recent comprehen- 

 sive geological treatises of Sir Archibald Geikie and Prof. 

 Prestwich. Finally, I would express my gratitude for the 

 great courtesy of Prof. Fraipont, of Liege, in assisting me 

 to an appreciation of the facts relating to the late remark- 

 able discovery of two entire skeletons of Paleolithic man 

 in the grotto of Spy. 



Comparative completeness is also given to the volume 

 by the appendix on the question of man's existence during 

 the Tertiary period, prepared by the competent hand of 

 Prof. Henry W. Haynes, of Boston. 



I trust this brief treatise will be useful not only in 

 interesting the general public, but in giving a clear view 

 of the present state of progress in one department of the 

 inquiries concerning man's antiquity. If the conclusions 

 reached are not as positive as could be wished, still it is 



