ELEVENTH EDITION, ENTIRELY REVISED. 



?fiqc$iple$ of G^eolo^y; 



OR, 



THE MODERN CHANGES OP THE EARTH 



AND 



Its 5 n habitants considered as illustrative of Geology. 



In 3 "Vols. Svo. Cloth. 



Illti^ted wittj M&P& kte& ki\d Wooddut^. 



Price, $8.00. 



" I have followed the rule adopted in my first volume, of reprinting the Preface to 

 the tenth edition, by which the reader will be directed to those numerous and important 

 additions and corrections which I found necessary, in consequence of the progress of 

 the science during the fifteen years which separated the Dinth and tenth editions." 

 Extract from Preface. 



In this last edition of Principles of Geology, Sir Charles Lyell has set the seal of 

 his matured experience and convictions upon a work which has for years held the 

 position of a classic in the literature of science. Encyclopaedic in its scope, and ex- 

 haustive in its treatment of every department of that study for which our language has 

 no name exactly equivalent to the German Erdkunde, the Principles of Geology may 

 be looked upon with pride, not only as a representative of English science, but as 

 without a rival of its kind anywhere. Growing in fulness and accuracy with the growth 

 of experience and observation in every region of the world, the work has incorporated 

 with itself each established discovery, and has been modified by every hypothesis of 

 value which has been brought to bear upon, or been evolved from, the most recent 

 body of facts. Its successive editions thus stand as a series of landmarks, indicating 

 the gradual expansion or rise of geological knowledge during a lifetime happily pro- 

 longed over at least two average generations. In the impression now before us the 

 veteran geologist might be expected to have comparatively little to add by way of novel 

 matter to the thoroughly revised and largely rewritten edition, the tenth in order, 

 which he put forth scarcely more than three years ago, separated as that edition was 

 by an interval of fifteen years from that immediately preceding it. There are, notwith- 

 standing, sundry points of importance which call for notice as contributing to the 

 facts comprised within his general scope, as well as enhancing the unity and force of 

 the argument which runs through the length and breadth of his system. These editions 

 have reference in the main to three large questions which may be said just now to en- 

 gross among them the most lively and active interest among students of Nature. The 

 first of these questions is that of volcanic action, as manifested especially in geysers, or 

 as diversely affected by water. The second is the latest phase assumed by the discus- 

 sion upon the Darwinian theory. And the third is the existence and distribution of 

 oceanic life at great depths, as determined by recent dredging operations. 



D. APPLETON & CO., Publishers, 



549 &. 551 BROADWAY, NEW YORK. 



