i8o 



PLATE XCI SNOW-DUNES. 



FIG. 1 (Map B). From a photograph by L. C. BERNACCHI (Be. 126, ^-plate), 

 Oct. 22, 1902; taken looking S. on the hills about the 'Discovery's' 

 winter-quarters. Crater Hill forms the background. 



FIG. 2 (Map B). From a photograph taken simultaneously by E. H. SHACKLETON 

 (Sh. 172, ^-plate) ; looking N. over the same patch of snow-dunes ; the 

 sea- ice of M'Murdo Sound forms the background, beyond the rocky tops of 

 Harbour Heights ; Oct. 22, 1902. 



These two pictures, giving views from opposite sides of the same snow-dunes 

 or "sastrugi," were taken 400 feet above sea-level. The snow thus modelled is 

 hard like ice, and merely chips when struck with an iron shovel. It is, however, 

 still opaque and white, not blue or translucent. 



Ferrar, Nat. Hist. Rep., vol. i., p. 84. 



