ON COLLECTING AT CAPE ROYDS 



FIG. 2. 



DIAGRAMMATIC SECTION OF BLUE LAKE 



The part shaded with short vertical lines is the uppermost " prismatic " layer of ice. The 

 convex upper surface of the lake is indicated, and the irregular thickness of the prismatic 

 layer. The area marked by little arrows is the clear transparent ice which fills the whole 

 lake to the bottom. The bed of the lake is of angular fragments, and the dark line over 

 them is meant to represent the film of vegetation which covers the bottom. At the bottom 

 of the shaft is seen the geologist chipping out some gravel and vegetation. 



