]30 Indian Forest Records, [VoL. I. 
Tt remains to indicate the various problems relating to the height 
development of single Sal trees, which await solution: — 
A . — Seedlings — 
I. The development of height growth : the determination of the 
current annual (or periodic) and mean annual height incre- 
ment of individual trees. 
II. The determination of the age at which the current annual 
and mean annual height increment culminates. 
III. The height corresponding to given diameters in different 
localities. 
IV. The efiect of thinnings (or growing space) on height develop- 
ment. 
-Coppice shoots — 
The total height of coppice shoots at different ages. 
The current annual and mean annual height increment of iii- 
dividual coppice shoots. 
The effect of the age (or size of diameter) of the tree coppiced 
on the height development of the resulting coppice shoots. 
The effect on the height growth of the thinning out of super- 
fluous coppice shoots. 
Section 3. — Gikth Increment. 
Laws which govern the girth development of single trees in general : — 
I. In good soils, girth increment culminates at an early age, and subse- 
quently diminishes fairly quickly. 
II. In poor localities, girth increment is very slow, but remains constant 
for a long period. 
111. In very crowded woods, the aimual girth increment begins to diminish 
at an earlier date and continues to fall more cjuickly than in open 
voods. 
The development of the girth of Sal trees has for some time received 
the attention of Indian foresters in connection with the preparation 
of Working-Plans, primarily for the purpose of ascertaining the age 
at which the principal trees of a Sal crop may be expected to attain 
girths varying from 5|- to 7| feet. With this object in view, experi- 
mental plots have been established in several of the forest reserves imder 
systematic management ; and in these the girth of selected trees are 
annually or periodically measured. But a great deal still remains to be 
B.- 
I. 
II. 
III. 
IV. 
