REPORT OF COMMITTEE OX PHOTOGRAPHS. I 7- > 



404 (543). Glens Falls, Hudson river. The great volume of the Hudson river below 

 Albany is not due to a rainfall supply gathered from a large basin, but to the 

 drowning of the river by a slight depression of its valley below sea level. 

 The view at ( dens Falls shows the river in its proper dimensions. It lias 

 here cut down through a drift cover by which it has been diverted from its 

 ancient pre-glacial course, and at < dens Falls has been locally superimposed 

 on a series of horizontal strata, in which it has cut a rocky gorge ami at the 

 head of which it descends in picturesque falls | YV. M. D.). 



40.") (804). Lake George : Panorama from Pearl point to Black mountain. 



406. Lower falls : Falls creek gorge ; Ithaca, N. Y. 



407 (79). Lake Placid and Mirror lake; from Grand View house. 



408(436). Indian pass; Adirondacks. 



409 (574). Western panorama from hotel Champlain; Lion mountain. 



410 (550). Lake Champlain : Looking northeastward from Westport. 



411 (560). The palisades of lake Champlain. 

 412(550). Barn rock ; lake Champlain. 



413 (521). Howes cave, X. Y.; "Alabaster hall." 

 414(515). " " " "The Eagle's wing." 



415(48). Keene valley, N. Y. ; Adirondacks. Characteristic view of lowland of 

 glacial gravels with which the bottoms of our northern valleys are often so 

 deeply clogged (W. M. D.). 



416 (20). Keene valley, N. Y. ; looking southward from Brook Knoll lodge. 



417 (43). " " " Tahawus house. 



41S (2.°,). - '• " Beede house. 



410(75). Ray brook; Adirondacks. A typical meandering stream in a marshv 

 flood-plain (W. M. D.). 



420 (707). Blue Mountain lake ; Adirondacks. Very expressive view of the smaller 



Adirondack lakes, whose origin is to be ascribed chiefly to obstruction by drift 

 of broad pre-glacial valleys in a rugged, rocky country (W. M. D.). 



421 (715). Blue Mountain lake; from Merwins. 



422 (404). Ausable chasm ; Adirondacks. A post-glacial gorge cut in Potsdam sand- 



stone. This is a good type of the many gorges of New York, all of which 

 may be classed as the product of streams turned across old rocky divides by 

 drift harriers now occupying their former valleys (W. M. !>.). 

 423(34). Upper Ausable lake ; from Boreas bay. 



424 (72). View from St. Regis mountain; Adirondacks. A good bird's-eye view of 



the lacustrine topography of a rocky drift -covered region. 



425 (559). Bog river falls ; Adirondacks. These falls, like all those of our northern 



states, result from the displacement of streams from their pre-glacial valleys 

 by drift obstructions which turned them over old rocky divides. This view 

 is taken where Bog river enters Tupper lake. The next view (426) shows 



the quiel Upper course of the same stream where it Hows over a drift surface 

 in it yet trenched on account of the rock harrier at the falls \\\ M. I >. 



426. Bog river ; near Tupper lake. 



427 (5(il i. Whiteface mountain summit. 



428 (1096). Stony creek : near Spectacle ponds. Typical form of meandering stream 



in floodplaiu anion-' the mountains. 



129(1057). Trap dike; Avalanche lake. Massive mountains of foliated gneiss*, 

 intersected by a dike that has weathered out, leaving a chasm I W. M. I». . 



130(1055). Avalanche lake; Adirondacks. A pre-glacial rock-walled vallev ob- 

 structed by glacial drift (W. M. D.). 



431 (1204). Woods Moll, Mass, A low rocky and drift-covered headland between 

 Buzzards hay and Vineyard sound. The terminal moraine has strong develop 

 ment in this neighborhood. The tidal currents between the islands hen 

 abouts are very strong i W. M I >. 



