nV E. C. ANDKKUH. 



H25 



A very similui' cani; was actuall}' uljHrTVfd laHt January whilo 

 viniting Mount Kosciusko in company with ProfesHor T, W. E. 



David, who ill (7), foe llif> first, tiirif, ]\n<] satiHfactorily and floarly 



Fig, 12. —Ideal sketch illustrnting action of ice-Hheet at Kosciusko. 

 A A, KoKciusko Range; 1513, Snowy liiver Valley; CC, drainage of .Spencer 

 Creek; FFF, general direction of ice-motion; (iO, HH, ice eddies-caused hy 

 col QQ and mountain I'P; gQ, hanging valley caused by eddy HH. The 

 arrows indicate the motion of the ice at various points, as suggested by the 

 topography. 



Htated tlio existence of a magnificent Pleistocene glaciation for 

 this area, 



We insist again then, that first and last, the topography must 

 not be lost sight of. Without the aid of figures it would be 

 difficut to discuss the case in detail; several ideal examples may, 

 however, be considered briefly. 



(i.) Canons ojnniny on to Flats or broad Valleys and facing the 

 general direction of the Ice-Flow. 



The general land-surface would l^e but very slightly eroded, 

 since there are few marked descents or convergences to increase 

 velocity, and hence produce heavy local ice-thrusts. The basal 

 ice, however, upon reaching the canons would suffer convergence 

 in being forced to flow up these narrow trenches while sealing 

 the range. Hence added velocity with strong,' corrasion of these 

 caflon bases. 



Example s. — Finger Lakes of New \ovk {(). 



