Knowledge 



PARTIALLY EXPLORED (SHADED), AND UNEXPLORED (BLACK) REGIONS. 



"A'h d to show the amount of exploration yet required to make known the entire surface of the earth. The spaces in black represent the 

 '- ly a few journeys which have given the physical features of route lines only. The shaded spaces indicate regions generally known by 

 liiids and seas which have been well explored, though some include large districts that have not yet been accurately mapped or surveyed 

 ueo of demarcation, but only, except where they coincide with coast linos, as general approximations. The areas of unexplored regione in 

 ic Regions, ;i,500,000; Antarctic Regions, .5,000,000; or a grand total of 20,000,000 square miles.— J. LOQAX LoBLEY. 



