2 4 6 



PLATE CXXT.V. BOULDERS ON FERRAR GLACIER. 



FIG. 1 (Map B). From a photograph by R. W. SKELTON (Sk. 80, -plate), Dec. 

 25, 1902 ; looking westward from amongst the ice-borne boulders of Knob 

 Head moraine on Ferrar Glacier. In the background are the Terra-cotta 

 Mountains, with Terra-cotta Peak on the right, composed mainly of sand- 

 stone and abundantly riddled by dykes of dolerite. The height of this 

 camp above sea-level was 3250 feet ; that of the Terra-cotta Mountains 

 about 8000 feet. See Ferrar, Nat. Hist. Rep., vol. i., p. 47 ; and, Scott, 

 Voyage of the 'Discovery,' vol. ii., p. 138. 



FIG. 2. From a photograph by H. T. FERRAR (F. 2, -nlm) ; taken on Dec. 9, 1902, 

 near Descent Pass. The boulder is of granite and has been hollowed to a 

 shell by the combined action of wind and weather. The cavity faces the S. 

 or weather side, and is therefore not open to the sun. Incrustations of 

 calcium carbonate are connected with the disintegration. See Ferrar, 

 Nat. Hist. Rep., vol. i., pp. 87, 88. 



