Part II] Hole : Regeneration of Sal (Shorea robustd) Forests 55 
The principal result of the present work has been to show that, in 
forests where frost damage is to be feared, sal seedings can be raised 
from seed very much more quickly by artificial sowings in open clear¬ 
ings of limited extent than under shade in the forest. Even when 
the method of regeneration under a shelter wood is adopted, there¬ 
fore, it may still be advisable to accept this principle of artificial sow¬ 
ings in small clearings for the regeneration of those areas where no 
seedlings have established themselves naturally and to regard such 
work as a part of the preparatory operations to be carried out before 
the initiation of the regular fellings. 
Experiments required to indicate the precise system or combination of 
systems most suitable for any particular forest. 
56. In order to discover what modifications of the system now 
suggested or what combinations of different systems are best suited 
for any particular forest, it seems advisable first to carry out a series 
of experimental fellings on a small scale, similar to those in the Dehra 
Dun forests reported in this paper. The experimental areas should 
comprise : 
(a) Small squares, the side of the square being f the height of the 
surrounding trees. 
(Jb) Large squares, the side of the square being at least three times 
the height of the surrounding trees. 
(c) Narrow strips running due north-south, about 300 feet long 
and with a width equal to £ the height of the surrounding 
trees. 
(d) Similar strips to (c) but running due east-west. 
These areas should be clear-felled as early as possible in the cold 
season, all dead leaves and debris to be burnt, existing seedlings cut 
out and the soil hoed at the beginning of the following hot weather. 
The seed to be sown broadcast throughout the experimental areas at 
the rate of 6 seeds per square foot of area. Sowing, if possible, to be 
deferred until the rains have well set in, and care being taken to see that 
the seed is healthy and in good condition. The sowings in any one 
set of experimental areas should be done as nearly as possible on the 
same day so that the results may be comparable. In Dehra Dun, in 
an average season, it is found that bad growth results in areas which 
get most side-shade from the south owing to the soil being there kept 
more or less constantly moist (e.g. in areas D and southern parts of A 
and B), that in those areas which get practically no side-shade at all 
(e.g. the central parts of area B), or only side-shade early in the morning 
[ *17 ] 
