Fart II. J 
Caccia : Develo'pment of Sal. 
181 
Two iacts appear to stand out very clearly— primarily, the influence 
of elevation above Mean Sea level ; and, secondarily, the effect of rainfall. 
Within the geographical limits of its distribution, statistics would appear 
to show that, everything else being equal, the mean annual girth incre- 
ment of Sal will fall with every rise above an altitude of GOO feet above 
Mean Sea level, and correspondingly increase with every rise in the mean 
annual rainfall above .50 inches : — 
i 
1 Forest Division. 
Mean annual 
Rainfall. 
Inches. 
[Elevation above 
Mean Sea level 
Feet. 
Mean annual Girth 
increment, for Sal 
trees 6 feet girth. 
Inches. 
Pilibhit, United Provinces . 
55 
630 
0*64 
Kheri, United Provinces 
47-6 
480 — 620 
0-70 
Darjeeling, Bengal 
175 
620 — 4000 
0-71 
Kurseong, Bengal 
145 
431 — 1900 
ro3 
Jalpaiguri, Eastern Bengal 
123-20 
300 — 400 
0-73 
More data are however required, and these are now being collected, 
to show the exact height above Mean Sea level and the approximate 
rainfall of each sample plot ; as well as soil and sylvicultural treatment. 
Turning now to the effect of the sylvicultural treatment on the develop- 
ment of the annual girth increment, considerable difference naturally 
occurs in the rate of girth growth of partially suppressed and dominant 
trees, a fact which should be clearly borne in mind in taking the measure- 
ments of type trees in sample plots. The following statement gives the 
results obtained in the few cases in which the measurements of the two 
classes of trees have been separately recorded ; — 
Name of Sal Reserve. 
Mean annual Girth increment. 
Dominant trees. 
Partially 
suppressed trees. 
Garhwal, United Provinces .... 
0-530 
0‘353 
Kurseong, Bengal ..... 
o’go 
0-58 
Jalpaiguri, Eastern Bengal .... 
0 899 
0-405 
PAET II p 
