19 



men can at once recognise up to what point the strip just com- 

 pleted extends. 



The duty of the surveyor in charge of the party is to see that 

 the callipers are properly applied, the diameters or girths read 

 before the callipers are removed, and the blaze -made on the correct 

 side. When a division into height-classes is necessary, the surveyor 

 has also to judge with his eye the height-class of each tree as it 

 is gauged. Hence the advisability of investing one and the same 

 person with the duties of both surveyor and recorder. 



The following is a sample of a convenient form of field-book 



RANGE COMPARTMENT 



BLOCK ... 



As the girth of each tree is called, a stroke is made in one of the 

 compartments opposite the figure expressing that girth. The first 

 four strokes are drawn upright, the fifth one obliquely across 

 <hem. Each group of strokes thus represents five trees of the 



BS 



