236 



CITRUS FRUITS AND THEIR CULTURE. 



Triangular System. 

 The triangular system 

 is sometimes referred 

 to as the hexagonal sys- 

 tem, but the latter sys- 

 tem is one of equilateral 

 triangles, while the term 

 triangular, as here used, 

 is applied to the method 

 of planting in inequi- 

 lateral triangles. For in- 

 stance, in fig. 55, the 

 trees are set in rows 

 thirty feet apart in the 

 rows running east and 

 west. But in every other 

 row the trees are set not 



Fig. 



9.1 



* 



Fig. 56. Square system of planting. 



55. Triangular system of planting. 



on the corners of the 

 thirty-foot squares, 

 but half way between the 

 corners, and the distance 

 from tree to tree diag- 

 onally across the field is, 

 planted per acre than 

 thirty feet. In fact, they 

 are about thirty-three and 

 a half feet apart. By this 

 method fewer trees are 

 planted per acre than 

 by the square system. In 

 laying out a grove by 

 the triangular method, 

 the field is first laid out 

 in squares. A line is 



