THE 



A L L E R Y 



OF 



NATURE AND ART. 



PART I. 



NATURE. 



BOOK II. 

 G E O L O G Y. 



[CONTINUED.] 



CHAPTER XXXI. 



SPRINGS, RIVERS, CANALS, LAKES, CATARACTS, AND 



INUNDATIONS. 



SECTION I. 



Origin of Springs and Rivers. 



A HIS subject is still involved in a considerable degree of obscu- 

 rity. The theories which have been chiefly invented to account for 

 it are the three following : 



I. The conveyance of the water of the ocean through subterra- 

 neous ducts or canals, to the place where the spring flows out of 

 the earth, and the fountain on the river commences. Water, how- 

 ever, could never in. this simple manner, by any power \ve are ac- 



VOL. Ill, B 



