Part II.] 
Caccia : Development of Sal. 
205 
Mr. F. A. Leete, I.F.S., has calculated that the normal stock per 
acre in a pure Sal forest under the selection system with a 6-foot cutting 
hmit should be : — 
class 6' and over 4i' — 6' 3' 4^' 
Number of stems per acre , 13 16 21 
He assumes that 75 per cent, of the stems of Class III will survive to 
pass into Class II, 80 per cent, of Class II will pass into Class I, and 90 
per cent, of Class I will be available for felling. If the above estimate 
be accepted as approximately correct the present abnormal condition 
of the Government Sal reserves as regards the higher girth classes will be 
apparent : — 
Class 6' and over 4i' — 6' 3' — 4i' 
Number of stems per acre . 1-3 3-7 10-6 
The latter figures do not however, in every case make full allowance for 
the proportion of the area occupied by stems of miscellaneous species 
other than Sal. 
Section 3. — Height Increment of Whole Woods. 
Laws which govern the height development of whole woods in general : — 
I. The laws which govern the height development of whole woods and of 
single trees are analogous : though the two do not progress in exactly 
the same manner. 
If. The annual height increment during earliest youth is comparatively 
slow, it then increases fairly rapidly, remains constant for a time, 
then decreases and ceases altogether or nearly so. 
111. The greater the aimual height increment at the commencement, the 
sooner will it culminate. 
The increase in height of each and every tree, added to the continual 
elimination of the shorter individuals tends to raise the mean height of 
the whole wood : but no data are at present available showing the pro- 
gress of the average height growth of an even- aged Sal seedling forest : 
neither is their collection at present possible. 
The same difficulty does not however arise in the case of coppice 
areas under systematic working, and the solution of this problem should 
now receive attention. In the Nawabganj forest of the Gonda Division, 
United Provinces, Sal coppice shoots in an even-aged coppice wood 20 
years of age are said to attain an average height of 30 feet. 
