60 



opposite to that in which the immediately preceding strip has been ^nrvayed On 

 Bteep slopes it is convenient to run the strips honzontaUy and to begin at the bottom 

 of the slope. The number of measnrere that can keep one recorder f nlly employed 

 depends on the density of the forest, on the nature of the ground and on whether 

 all or only certain classes of the trees composing the crop are to be measured, me 

 number di measurers for each recorder may then, according to circumstances, range 

 from a to 6, or even 7 or 8. As the survey progresses, the trees measured are im- 

 mediately marked. The mark should be made on the side towards the area still re- 

 maining to be surveyed; so that, when the next strip is being examined tLe "en can 

 at once recognise up to what point the strip just completed extends. The duty ot the 

 recorder is to see that all the trees are measured, that the calipers are properly 

 applied, the diameters read before the calipers are removed, and the mark made on 

 the correct side of each tree measured. He should also note the distinction drawn by 

 the measurers between sound and unsound trees; and he should keep his men, as tar 

 as may be, in sight and in line. When a division into height classes is necessary, he 

 has also to measure, or to estimate by eye, the height class of each tree as it is gauged. 



Recording the results of the enumeration.— The following is 

 a sample of a convenient form of a field-book for enumera- 

 tion surveys, in which the classes include a range of diameters 

 and the forest is very irregular. Some of its advantages 

 are:— (i) it requires very little ruling, (ii) it may he easily 

 prepared from day to day by the recorder himself, and (iii) 

 as the width of its different columns can, for that reason, be 

 varied to suit the composition of the crop to be surveyed, a 

 whole day's work, comprising the record of several thousand 

 trees, can be compressed into a single opening of the book- 



The numbers of trees are shown by dots and strokes. 

 Each group, representing ten trees, consists of two upright 

 rows of four dots each, joined by two diagonal lines 

 which represent, respectively, the ninth and tenth trees. 

 Thus, 5^ = 10, iii=z9, ::=8, || = 7;l: =6; andso on. 



