Part Y.] Statistics compiled in the Silviculturist's office. 
43 
Species— CEDR US DEODAR A. 
Effect of Thinnings. 
Some sample.plots laid out to test the effect of thinning were remeasured. 
The first pair w x ere laid out in Dartrund forest, Chamba State, 
Punjab, by Mr. Lace in 1899, Aspect E., Elevation 7,000 feet, Slope 
25°to 30°, Age in 1899—87 years, Height about 84 feet. Open to grazing. 
UNTHINNED PLOT. 
THINNED PLOT. 
Area on the slope 
1 ACRE. 
Area on the 
! SLOPE 1 ACRE. 
No. of 
Sectional 
No. of 
Sectional 
trees. 
area (sq. ft.). 
trees. 
area (sq. ft.). 
June 1899 . 
141 
252-9 
Originally . 
153 
237-7 t 
May 1915 . 
131 
282 1 
After thinning— 
June 1899 
73 
136-1 
May 1915 
59 
164-4 
The unthinned plot shows a difference of 29'2 square feet or 11'5 per 
cent, increase in 16 years. 
The thinned plot shows a difference of 28'3 square feet or 21 per cent.. 
increase in 16 years. 
The actual increment in both plots is thus much the same, but in 
the thinned plots it is put on to fewer trees. 
The second pair were laid out in Gothan forest, Chamba State, by 
Mr. Lace, also in 1899. 
Aspect N.N.W. Elevation 6,300 feet, Slope 25° to 30°, Age in 1899— 
90 years. Height 90 feet, Soil heavy clay. Closed to grazing. 
UNTHINNED PLOT. 
THINNED PLOT. 
Area on the slope § acre 
Area on the slope § acre. 
No. of 
trees. 
Sectional j 
area (sq. ft.). 
No. of 
trees. 
Sectional 
area. (sq. ft.). 
October 1899 
92 
136-9 
Originally 
129 
July 1912 . 
84 
162-9 
After thinning— 
October 1899 . 
81 
993 
July 1912 . 
77 | 
118-7 
The unthinned plot shows a difference of 26 square feet or 19 per cent. 
increase in 13 years. 
Thinned plot shows a difference of 19 4 square feet or 19 per cent. 
increase in 13 years. 
The actual increment in this case is less in the thinned plot; and as 
the percentage ot increase is the same in both plots, thinning seems not. 
to have affected the rate of growth of individual trees. 
C 301 ] 
