4 
BULLETIN OF THE NATURAL HISTORY SOCIETY. 
with the mainland by a bar, is marked on the maps as a 
point, — the Dixon Point of the Geological map. The island 
consists of a foot or two of soil bearing a close turf, resting 
upon flat ledges which come two or three feet above high 
tide. As in case of Fort Monckton, the upland can be 
removed only in proportion as the ledges are eroded, on 
which account its recession will be slow despite the fact that 
