GEOGRAPHY. 145 



Levels in London. 



Above the highest 

 water mark. 



Ft. Inch. 



North end of Northumberland street, 7 1Q 7 



Strand j 



Ditto of Wellington street, Strand . 35 6 



West end of Coventry street ... 52 



South end of St. James's street . . 13 3 



North end of ditto 46 7 



North end of Drury lane 65 



North end of Regent street . ... 76 



Centre of Regent circus 77 



North end of Cleveland street . . . 80 10 



The whole of Westminster, except the Abbey and 

 part of Horseferry road, is below the level of the 

 highest tide. 



The breadth of the Thames at Westminster-bridge 

 is about 400 yards. 



Square Miles. 



To convert the English square mile into a measure 

 applicable to the maps of all civilized nations, it is 

 only necessary to reckon it as f ths of the area of the 

 square geographical mile ; in other words, that four 

 English square miles are equal to three geographical. 



Temperature of the North Pole. 



Dr. Brewster estimates the mean temperature of 

 the north pole at about 11 Fahrenheit, which is in- 

 comparably warmer than Melville island in lat. 75, 

 where the mean^ temperature was found to be minus 

 2, or two degrees of Fahrenheit below the freezing 

 point. It is probable, therefore, that the north pole 

 of the globe is not the coldest point of the arctic 

 hemisphere, but that there are two points of greatest 

 L 



