SIGNS OF PAST GLACIATION. 65 



border of an ancient lake upon whose bosom floating ice 

 had brought these objects from their distant home in 

 Canada. But this theory would not apply to the portion 

 of the State which is south of the water-shed and which 

 slopes rapidly towards the Gulf of Mexico. Yet the dis- 

 tribution of boulders is practically uniform over the gla- 

 ciated area on both sides of the water-shed, constituting 

 thus an indisputable proof of the glacial theory. 



4th. As the significance of the gravel terraces which 

 mark the lines of outward drainage from the glaciated 

 area cannot well be indicated in a single paragraph, the 

 reader is referred for further information upon this point 

 to the general statements respecting them throughout the 

 next chapter. 



