76 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 
north-east side, and work towards the west or south-west. By so 
doing a compact mass of wood is interposed between the gales and 
the part of the wood undergoing regeneration, so that the trees 
which are semi-isolated in the advance, seed, or subsequent stages 
are well protected, and not likely to suffer much from gales, and 
the partially exposed surface of the ground is sheltered from drying 
winds. 
In the simplest form three bands are in hand at the same time. 
One of these bands (L) is in the light-felling stage, another (8) 
adjoining is in the seed-felling stage, while a third (P) is in the 
preparatory stage. All the wood lying to the westward of band 
P is still untouched, and consequently, so far, is not embraced by 
the process of regeneration. 
| 
Intact Wood P sage 
| 
West Side 
The simple case which we have just glanced at is often applicable 
to woods consisting of light-demanding trees where little advance 
felling is necessary ; in fact, it often happens, under such circum- 
stances, that band P can be dispensed with altogether, and so we 
have only to deal with bands S and L. On the other hand, where 
much advance felling and preparation are necessary, as is generally 
the case where the wood is very dense, or where we have to deal 
with trees provided with very shallow roots, as well as in windy 
regions, it is not sufficient to have only one band in the preparatory 
stage at any given time, but several must be simultaneously under- 
going moderate felling—that is to say, there must be several P 
bands. 
Another modification occurs where groups of serviceable advance 
growth fall to be dealt with. These will be met with irregularly 
distributed throughout the untouched wood, and light must be 
