2 ' author's preface. 



that since that time some of my views have undergone a 

 partial change^ not on the main points, but only upon second- 

 ary questions, which in their very change but confirm former 

 results. 



Whilst preparing the first part of these lectures for publica- 

 tion, I had an opportunity of making use of two recent works 

 treating of the same subject. The one, Sir Charles Lyell's Anti- 

 quity of Man, the other. Professor Huxley's instructive and at- 

 tractive treatise, Man's Place in Nature. Lyell's book afforded 

 me the pleasure of seeing the Glacial theory, which at Gottingen 

 is to be buried again, revived and acknowledged by such high 

 authority. There is also found in it a collation, though a some- 

 what imperfect one, of facts which undeniably establish the 

 high antiquity of man upon the globe. I have been enabled in 

 the second part of this work to offer additional facts, owing to 

 the steady support of my scientific friends, Aeby, Claparede, 

 Desor, Fuhlrott, Gastaldi, His, Huxley, Morlot, Pictet, Quatre- 

 fages. Spring, Valentin, Broca, Busk, Collomb, Keller, Messi- 

 komer, Schild, and Schwab. It was, moreover, my good fortune 

 to be permitted to examine and to take the outhnes of the only 

 two perfect skulls which have hitherto been found associated 

 with the reindeer and the aurochs in caverns. I am indebted 

 for the use of these invaluable relics to the kindness of their 

 discoverer and owner. Dr. Garrigou, of Toulouse, who was so 

 obliging as to bring the skulls to Geneva himself. 



As the printing of this work, which was published in Ger- 

 many in parts, was somewhat delayed, opportunity was afibrded 

 me to correct it and render it more complete in several parti- 

 culars, partly by further researches of my own, partly by further 

 communications from my friends. The additions and remarks 

 thus rendered necessary in the German edition have been in- 

 corporated in the text of the English translation. 



But during this time attacks have not been wanting — we must 

 always be prepared for them. If they grow out of a scientific 

 soil, they cannot but be useful, by laying bare weak points and 

 stimulating to their correction ; but if they proceed from that 

 soil, from which the lilies of innocence and the palms of con- 

 ciliation should spring up, where, however, nothing but the 



