COMPLETE YIELD TABLES FOR BRITISH WOODLANDS 



lively rare when a string is used. In fact, the origin of 

 the use of string lies in the facility of its use in practice. 



Allowance for Bark. An allowance of 1 inch to 

 1 foot quarter girth has been made in respect of all 

 trees. 



Now, this allowance is really too much in respect of 

 smooth, thin-barked trees, but it has been adopted, since 

 it is customary in so many parts of the country. 



It must be distinctly understood that this deduction 

 for bark is by no means universal throughout Great 

 Britain, so that those who use these tables in districts 

 where this deduction is not customary, must make the 

 necessaiy allowances to suit the custom obtaining in 

 their own district. 



When making an allowance of 1 inch to 1 foot 

 quarter girth, it is usual to deduct 



an inch for trees under 12 inches quarter girth, 



1 inch for trees 12 inches quarter girth and under 



18 inches quarter girth, 



l inches for trees 18 inches quarter girth and under 

 24 inches quarter girth, 



2 inches for trees 24 inches quarter girth and under 



30 inches quarter girth, 



and so on, though in many cases quarter girths measur- 

 ing Avithin 1 inch or 1^ inches of 12, 18, 24, 30 inches, 

 and so on, would have the same amount deducted 

 therefrom for bark, as is deducted in the case of these 

 specific quarter girths. 



These deductions for bark average in a general way 

 about 12 per cent., or (say) one-eighth of the contents 

 as measured over bark. 



Now, if one-eighth of the contents over bark has 

 been deducted, and the contents under bark are given, 

 the contents over bark may be immediately found 

 by adding one-seventh of the contents under bark as 

 given. 



Prices of Timber. In order to show the financial 

 returns of the various crops, it has been necessary to 

 value the timber. Now, the value of timber must vary 

 very greatly in different localities, but the prices which 

 have been adopted may be taken as fair average prices, 

 provided there be a fairly good market within a reason- 

 able distance. 



All the timber (down to 3 inches in diameter) has 

 been valued, though of course, in practice, " tops " below 

 6 inches quarter girth are usually "thrown in " ; but, as 

 already indicated, it is necessary in the following tables 



