182 AUTIFKIAL FORMATION OF WOODS. 



In the one case 



,, ^ L X ]] B L , 



r/- X -866 <l 'Id X -biUJ '■ 



In the other case 



.., ^ LxB B 



' d~ X -866 ^r 



The first term in this and the two previous formulas 

 represents the bulk of the plants. By neglecting the com- 

 paratively small number represented by the other terms, the 

 following short approximately correct methods of calculation 

 are obtained for each acre of plantation : — 



Square planttitq — 



^, ^ 43560 



Square of planting distance. 



Triangle planting — 



Square of side of triangle 



Ia)ic jilantiiK/ — 



^ _ ' 43560 



Distance between lines x distance in lines. 



Accordingly, the following numbers of plants arc required 

 per acre in the case of square planting : — 



Calculated by the Caloulated by the 

 Accurate A])i)io.\iniato 



Formula. Foniiula. 



Distance 2 feet x 2 feet = 10,994 10,890 



8 feet X 3 feet = 4,887 4,840 



4 feet X 4 feet = 2.749 2.722 



5 feet X 5 feet = l,7(i() 1.742 

 (•> feet X r, feet = 1,223 1.210 



