26 SUMMEE IN A BOG. 



mica-slate, that of quartzite, all telling of an 

 origin in regions farther North. 



There is a pasture-field among the hills 

 where the origin of streams is pleasingly exem- 

 plified in the birth of Mink Run. The slope is 

 gradual and the quantity of water, from the 

 water-sheds at no time so great as to deface 

 the verdant sod. A few springs add their 

 perennial product to form the shallow thread 

 of water which marks its course by the fresh 

 green line of water-cress and other herbage at 

 the base of the hill. 



Here the little stream takes a turn and a 

 sudden change now appears. The hill, whose 

 western slope was gentle and clothed with ver- 

 dure, is cut into a deep chasm on its northern 

 face. A bit of forest has had time to grow 

 and rot, how many times over it is hard to tell, 

 since first the ice-sheet melted in the rays of 

 the sun. An opposite hill of almost precipitous 

 incline is lined with springs and swamps; fur- 

 ther on is a forest. 



The slender thread of water courses through 

 a bed tortuous and deep. When the windows 

 of heaven are opened and the clouds pour out 

 their contents, this brook becomes a raging and 

 turbid torrent, carrying all before it. From 

 the steep riven hills the floods descend and 

 through the valley surges a small river. 



