22 CONTRIBUTIONS TO THE 



in composition as in size. These accumulations lie many feet 

 above any high water mark of which record or memory remains. 

 To be reckoned in millions of tons, they lie where they were left 

 of old in the rocky peninsulas between the floods. We may find 

 them at greater or less elevations, alternating with deposits of 

 sand, earth or clay, now presenting beautiful banks with differ- 

 ing colored strata, or again in a rude aggregation of unassorted 

 drift. Wherever found, and whether near or remote from exist- 

 ing water-courses, from which many of them are far removed, 

 these terrace-like elevations tell us of the waters that brought 

 them there. 



A mile south of Rock Rimmon, passing over an elevated sand- 

 plain, one comes suddenly to the brink of high bluffs, which as 

 surely once looked upon a lake below them as Boar's Head looks 

 upon the sea. The height, the waving contour-line following 

 the shores of bays and inlets, the sunken river beds beyond and 

 the shoals stretching between, all testify to the occupation and 

 conquest of water in that sub-glacial era, of which so little is 

 known, but concerning which so much still remains in records 

 awaiting research and interpretation. 



We know in a half-thinking way that a great city occupying 

 the site of ancient Derryfield is built upon sand. How came it 

 here ? To this there can be but one answer : It was made in 

 the first instance and fetched here by water, however much it 

 may have since been tossed about by the wind or shovelled about 

 by man. In a similar mood we carelessly tread beneath our feet 

 in the concrete foundations of our public walks the stones worn 

 smooth in the beds of the elder floods. Our forests grow, our 

 harvests thrive upon soil leached and filched from the moun- 

 tains, while the very walls that give us shelter are built of clay 

 ground in the glacial mills and precipitated in the still waters 

 of glacial lakes. 



With the approach of summer the thoroughfares to the White 

 Hills will be thronged with pilgrims. In the ceaseless but un- 



