Part II] Hole: Regeneration of Sal ( Shorearobusta) Forests 3 
CHAPTER II. 
Experiments carried out during the period 1915-1919. 
Objects of work. 
3. As the system of regeneration suggested above was, to some 
extent, contrary to existing ideas, it was advisable to obtain further 
evidence regarding it during a series of years, so that it could not be 
argued that the good results hitherto obtained were due to exceptionally 
favourable seasons. Evidence was also required as to the comparative 
merits of alternative methods of treatment which had been suggested. 
Finally, further details were needed to determine what may be regard¬ 
ed as the ideal seedling development for the locality and to elucidate 
the injurious action of a layer of dead leaves on germination and 
early growth. Work was accordingly continued on these lines during 
the years 1915-18. 
Details of local rainfall. 
4. As an indication of the general character of the seasons during the 
period covered by this work, the following table is given which shows:— 
(1) The average monthly and annual rain-fall at Dehra Dun for the 
period 1878-1910, and (2) the monthly rainfall during the 
period June 1909 to January 1919 :— 
Jany. 
In. 
Feb. 
In. 
Mar. 
In. 
April 
In. 
May 
In. 
June 
In. 
July 
In. 
Aug. 
In. 
Sept. 
In 
Oct. 
In. 
Nov. 
In. 
Dec. 
In. 
Total 
for 
Year. 
In. 
Average rainfall 
for period 1878 
to 1910. 
2-27 
2*33 
0*98 
0*70 
1*48, 
8*42 
27*00 
30-55 
9^43 
0-89 
0-30 
0-87 
85*22 
Rainfall in 1909. 
.. 
10*32 
42*82 
42-71 
6-03 
0-02 
.. 
1*98 
.. 
„ 1910. 
1*72 
0*98 
0*74 
1*16 
5*13 
34*55 
47-03. 
12-31 
5-24 
0-23 
109-09 
„ 1911. 
9*05 
0*59 
7*18 
0*21 
0*16 
10*76 
4*39 
25-38 
15-88 
1*70 
4-55 
.. 
79-85 
„ 1912. 
1-96 
0’72 
0*81 
0*48 
0*57 
5*13 
12*53 
28-89 
9-98 
.. 
1* 23 
0-44 
62-74 
„ 1918. 
0*17 
8*12 
2*42 
0*06 
2*30 
17*19 
16*77 
11-03, 
0-38 
1-39 
0*17 
1-67 
61-67 
„ 1914. 
0*01 
3*28 
2*62 
2'81 
1*27 
6*37 
25*72 
19*89 
12*34 
1*54 
0*18 
0*03 
76*06 
„ 1915. 
3*34 
4-98 
2*63 
0*39 
1*06 
11*92 
19-24 
34-91 
9-25 
0-27 
— 
0-21 
88-20 
„ 1916. 
0-61 
1*25 
0*02 
C-38 
1*28 
20*64 
23-40 
29-83* 
13-26 
3-71 
.. 
.. 
94-38 
„ 1917. 
0*43 
1*32 
1*76 
1*52 
1*79 
8*39 
39-77 
27-72 
26-36 
6-92 
.. 
1-00 
116-98 
„ 1918. 
0*54 
1*23 
2*17 
1*82 
8*93 
9-46 
i 16-65 
4-45 
0*31 
0-04 
0*13 
45-73 
[ 165 ] 
