162 SYLVICULTURE IN THE TROPICS pt. 



ii 



the distance between the lines will be equal to the 

 height of the triangles. In each alternate line the 

 first planting-peg will be put at a distance from the 

 base line equal to half the distance between the plants 

 (see c in Fig. 50). 



Where labour is cheap and abundant, surveying 

 implements are only utilised for laying two base lines 

 at right angles to each other, or, if the area is large, 

 for laying offsets from the principal base line from 

 distance to distance, as guides to the workmen. 



Fig. 51. 



The following method of lining is used on Ceylon 

 plantations : 



A piece of land ABCD (Fig. 51) having to be lined, 

 a suitable base line EF is selected and marked out, 

 and from the most convenient spot on it an offset GH 

 is marked off at right angles to it. A rope, having 

 knots of red cloth at distances equal to those which 

 the lining-pegs are to have from one another, is then 

 stretched from G towards F, and pegs put in by the 

 red knots at points 1, 2, 3, 4, 5, etc. If the square 

 pattern is adopted (as in the figure), the same rope is 

 stretched towards H and pegs put in at a, b, c, d, etc. 



