514 



N.--(p. 403.) 



NUMBER OF PLANTS ON AN ACRE, 



The following table shows the number of plants contained in an acre, 

 planted at the several distances specified in the columns marked " feet 

 apart." For example, an acre will contain 10,890 corn-hills two feet 

 apart ; 2,151 four and a half apart, &c. These numbers are obtained 

 by dividing 43,560, the number of square feet in an acre, by the square 

 of the number of feet the plants are distant from each other; thus — 

 the square of 2 is 4, and 43,560 divided by 4 gives 10,890, as above. 

 If the plants be set in an oblong form, as five feet by six apart, multiply 

 the two distances together, and divide 43,560 by their product, for the 

 answer. When setting out trees, farmers generally name the distance 

 in yards. In this case, divide 4840, the square yards in an acre, by 

 the square of distances apart, if they be equal, or by their product if 

 they be unequal, and the quotient will be the number of trees in an 

 acre. For example : at 7 yards apart, an acre contains 98 trees ; for 

 the square of 7 is 49, and 4840 divided by 49 gives 98, the nearest 

 whole number. If the distances be 7 and 10, their product is 70, and 

 4840 divided by 70 gives 69 trees. — Newbern Spectator. 



