An Introduction to Physical Geography 23 



tion was called for within a few weeks 

 of the publication of the first. But 

 the volume will gain a wider field than 

 the ordinal text-book, for it will ap- 

 peal to that growing class of amateurs 

 who have b^en seeking a plain but 

 fascinating description of the present 

 and past facts of the earth. 



The treatment, so far as possible, is 

 concrete.. Wherever practicable, each 



Figure No. i is a picture of the noted 

 Watkins Glen, which during the pro- 

 cess of time a small stream has carved 

 in the soft rock of the mountain. In 

 some places the stream has cut to a 

 depth of 200 feet ; sometimes the gorge 

 is scarcely more than 10 feet wide, and 

 at others broadens into large amphi- 

 theaters, in which one's voice echoes 

 and reechoes with weird effects. The 



From Gilbert's and Brigham's " Introduction to Physical Geography." D. Appleton & Co. 



Figure No. 2. — A Pebbly Rock Carved by Rain; Russian River, California 



subject is opened with a type case, 

 illustrated by a picture of some graphic 

 example. About one-half of the book 

 is given to the lands. The relation of 

 organisms to the earth is introduced 

 wherever appropriate. 



Two hundred and sixty-three illus- 

 trations, all very well chosen and ad- 

 mirably engraved, accompany the text. 

 By permission of the publishers, six 

 typical illustrations are reproduced in 

 this Magazine. 



chasm is at the head of Seneca Lake, 

 New York, from which, winding and 

 curving abruptly, it penetrates Glen 

 Mountain for a distance of three miles. 



Figure No. 2 is a graphic example 

 of the effect of rain wash. Rain has 

 soaked and softened the rock ; then 

 little rills have started, and have grad- 

 ually worn deep channels of their own, 

 making the high pinnacles. 



Figure No. 3 illustrates the differ- 

 ent kinds of rock, some hard and some 



