CHAPTER XXXIV. 



Rules for Ascertaining the Number of Trees or 

 Plants that can be set on an Acre. 



First When they are set in the common order, that is, in the 

 form of squares or rectangles. 



RULE. Multiply the distance in feet the rows are apart by 

 the distance apart in the row, and divide 43,560 the number of 

 square feet in an acre by the product. 



Example : How many trees, 20 feet apart each way, can be 

 set on an acre? 



Solution : 20 multiplied by 20 equals 400, or the number of 

 square feet each tree will occupy; 43,560 divided by 400 

 equals 108.9, or * ne number of trees. 



Second When set in the quincunx order, as in the diagram : 



B C 



E 

 A D 



RULE Multiply the distance apart in feet in the row (from 

 A to B ) by the distance apart diagonally (from A to E); mul- 

 tiply the product so obtained by ,866, and divide 43,560 by the 

 product last obtained. 



Example : How many trees, 20 feet apart each way, can be 

 set in the quincunx order on an acre? 



Solution : 20 multiplied by 20 and the product multiplied by 

 .866 equals 346.4, or the number of square feet each tree will 

 occupy; 43,560 divided by 346.4 equals nearly 123, or the 

 number of trees. 



Note /. Half the distance from A to D may be found by 

 multiplying the distance from A to E by .866. 



Note 2. The tree at E should be in the center of the rect 

 angle formed by those at A, B, C and D. 



