30 



BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



again, and going south we soon pass into regions thickly covered with 

 the same underbrush which is so characteristic of the shores of all the 

 Bahama Islands ; and inland we get patches of aloes, of palmettos, and 

 of tlie forest trees characteristic of the Jiahamas. 



The arch of the Glass Window was evidently formed by the undermin- 

 ing action of the sea, which little by little disintegrated the underlying 

 rock ; finally the overlying arch gave way in part, leaving an opening 

 known as the Glass Window, and remnants of the rocks forming the 

 arch lining the western sides of the opening. 



THE GLASS WINDOW. 



P)0th the northeast and northwest winds act upon the southern shores 

 of Northci-n l'>lcutliera, and are gradually eating away the outer shore 

 shelf, forming low vertical cliffs, and leaving here and there numerous 

 isolated rocks in from two to three feet of water, more or less water 

 worn, and ci-odcd or diminutive islets formed by the general subsidence 

 and liv erosion, whi<:'h will gradually disappear and finally leave only the 

 uniform flat level of the parfs of the bank adjacent to the islands. An 

 examination c>f the large-scaled charts of the ])ahaiiias will show a large 

 luu'iibcr of such islets and islands anywhere in this group, either on the 

 windward or lee faces of the larger islands (see I'latcs IX., XIL). "I'liese 

 diifereut islets are now prominent, according to the height of the original 

 hills of which tliey once made a part, or form shallow j)ortions of the 

 orincijial banks. The long island to the south of Savannah Sound, on 

 :ho east face of l"Ieuthei-a, is an excellent example of such sloughing oil 

 (I'lateX. Fi- '-')• 



The west face of Xortliern Eleuthera, as seen from our anchorage off 



