46 



VOLUME OF WHOLE WOODS. 



c. TJw Booking of the Measurements. 



In measuring the diameter, the gaugers call out each 

 measurement, and in mixed woods also the species ; the book- 

 keeper enters each announcement, repeating it at the time, so 

 as to prevent mistakes. 



A hook-keeper may work with one or two gaugers, the 

 party taking a narrow strip of the wood at the time ; each tree 

 is marked as soon as measured, preferably with chalk.* 



The booking can be done in a variety of ways, as the follow- 

 ing samples will show : 



The first method of booking is least liable to errors. 



d. Selection and Number of Sample Trees. 



As the volume of the whole class is to be calculated from 

 that of the sample tree, it is necessary to select for the latter 



* In some parts of India it is customary to paste small pieces of paper on 

 the trees, each different colour representing a distinct class ; this method has 

 for its object to facilitate the control exercised by the supervising officer. The 

 method was introduced by Mr. R. Ellis, Deputy- Conservator of Forests. 



