204 



PLATE GUI. GLACIER TABLES. 



FIG. 1. From a photograph taken by C. R. ROYDS (R. 140, 5" x 4" film) ; on the 

 old ice near Black Island, M'Murdo Sound, Sept. 15, 1902. 



FIG. 2 (Map B). From a photograph taken by L. C. BERNACCHI (Be. 104, ^-plate) ; 

 on the old ice near Black Island, M'Murdo Sound, Sept. 28, 1902. 



These glacier tables are not uncommon amongst the fantastic shapes assumed 

 by old and weathering glacier-ice. The " mushroom " shape results from the 

 absence of included grit and gravel in the upper ice- slab, while the ice upon which 

 it rests, having much, is rapidly disintegrated. They are rarely more than a few 

 feet in height. 



The two here represented were found on the sheet of old ice at the head of 

 M'Murdo Sound. For an account of the composite origin of this sheet, partly from 

 the Great Barrier and partly from Koettlitz Glacier, see Ferrar, Nat. Hist. Rep., 

 vol. i., pp. 15, 80, 90 ; and for further illustrations of its very irregular surface, see 

 Plates XCIX. to CI. 



See also, Scott, Voyage of the 'Discovery,' vol. i., p. 209. 



