GEOLOGICAL SKETCHES. 



By Louis Agassiz. First Series. With Illustrations. 

 Crown Svo, gilt top, $1.50. 



CONTENTS: 



I. America the Old World. 

 II. The Silurian Beach. 



III. The Fern Forests of the Carboniferous Period. 



IV. Mountains and their Origin. 

 V. The Growth of Continents. 



VI. The Geological Middle Age. 



VII. The Tertiary Age, and its Characteristic Animals. 

 VIII. The Formation of Glaciers. 

 IX. Internal Structure and Progression of Glaciers. 

 X. External Appearance of Glaciers. 



This work has been extensively read and admired for the sim- 

 plicity and beauty of its style, the vividness of its descriptions of 

 Nature, and the grandeur of its views of the world's progress. 

 Professor Agassiz reviews the prominent events of the successive 

 eras in a manner that cannot fail to charm and instruct the most 

 unscientific reader. — American Journal of Science. 



The style of these essays is clear ; the information such as to 

 stimulate, as well as enlighten, the mind ; and the illustrations 

 serve as good aids to the thorough comprehension of the text. — 

 Boston Transcript. 



GEOLOGICAL SKETCHES. 



By Louis Agassiz. Second Series. Crown Svo, 



gilt top, $1.50. 



CONTENTS: 

 I. Glacial Period. 

 II. The Parallel Roads of Glen Roy, in Scotland. 



III. Ice-Period in America. 



IV. Glacial Phenomena in Maine. 



V. Physical History of the Valley of the Amazon. 



This volume, taken in connection with the first series of " Geo- 

 logical Sketches," presents in a permanent form, and in their 

 proper order, all the essavs Professor A»assiz wrote in his ma- 

 turer years on geological and glacial phenomena. 



These papers, rich with accumulated stores of scientific lore, 

 and seeming, in their simple but animated and engaging style, to 

 be genuine outgrowths of their author's temperament, as well as 

 of his wiBdom, need no recommendation. — Boston Advertiser. 



