236 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 
and as they are all to be cut over within the space of 20 years, 
it follows that the average area available for each year’s felling 
is slightly over 113 acres. But the density of the stock is 
very unequal, and inconvenient variations in the annual yield 
would result from dividing the woods into twenty equal annual 
felling-areas of that size. Hence, the figures in the 6th column 
of the subjoined Table (which represent the relative densities of 
the crops in the various woods!) have been made use of to 
enable the areas of the relatively poorly-stocked and relatively 
well-stocked ground to be, respectively, increased or reduced in 
inverse proportion to the density of the crops they carry; the 
annual yield has thus been more or less equalised. Then, as 
a precaution against the spread of attack by beetles, it has been 
arranged that fellings on contiguous areas shall not be made 
at shorter intervals than four years ; for example, the fellings in 
No. 40, Dundonald Muir, will be made in the 3rd, 7th, 11th, 
15th, and 19th years; and similarly for No. 21, Cardenden, 
No. 26, Bairnsbridge, and others. It has further been decided 
to avoid leaving small plots of detached woods standing’after the 
main portion of them has been cut over. The Table of Fellings 
has been drawn up so as to give due weight to all of these 
considerations, which, it will readily be understood, do not admit 
of an exactly equal annua! yield being provided. The arrange- 
ment proposed is that which appears the best under the cireum- 
stances, though it unavoidably involves considerable variations 
in the areas to be annually replanted. 
1 See p. 233. 
