[ 7^ I 



fufEciently accurate for the purpofes for which ftatiftical tables 

 are intended ; for minute precifion is impoflible, and if poffi- 

 ble would be unnecefTary. 



Method of nearly determining the true Areas of Maps on the Conical 

 and Circular ProjeSlions. 



Parallels of latitude, diftant from each other one degree, will 

 divide the fpherical furface of the earth into t 8o narrow zones ; 

 the area of each of thefe, in fquare miles of 60 to a degree, is 

 found by multiplying its fine in miles and decimals of a mile by 

 21600, the circumference of a great circle in fuch miles ; and 

 the area of each zone, thus found, divided by 360, will give 

 the area of each of the quadrilateral fpaces, formed by the pa- 

 rallels, which include the zone and two naeridians diftant one 

 degree of longitude from each other : On this principle the fol- 

 lowing table was conftruded. 



tar 



