XX APPENDIX. 



(c) Over established reproduction the overwood can hardly 

 be felled too heavily except in areas in which the 

 possibility of frost damage prohibits the absolute 

 clearing of overwood over too wide areas." 



On the other hand Hole's researches go to show that the sal 

 seedling requires full overhead light for its proper development. 

 These opposite doctrines must somehow be harmonised and a silvi- 

 cultural system for the natural regeneration of sal worked out. 

 This investigation is now well in hand. 



Blanford has also shown in dealing with the teak in Mohnyin 

 (Burma) that burning of the soil covering and intense light are 

 necessary for the natural regeneration of this species. He relies 

 on the seed already dormant in the soil for his reproduction and 

 clear-fells the whole of the overwood. Hole's experiments at 

 Dehra also confirmed this silvicultural fact. 



In all methods of regeneration under a shelterwood it must be 

 remembered that two diametrically opposite considerations have 

 to be compromised (1) the necessity for retaining sufficient trees 

 to keep down the growth of weeds and to produce an ample crop of 

 seed, at the same time sheltering the young growth from drought 

 frost or hot winds ; and (2) the necessity of removing all cover 

 not absolutely necessary, so that the subsequent fellings of the 

 overwood will do as little damage as possible to the young regener- 

 ation. 



A compromise is therefore necessary and in the exact degree 

 of compromise lies the art of the .forester. 



The different light requirements of different species in a mixed 

 crop may be used by the skilful forester to manipulate the propor- 

 tion of species in his new crop. This is done in Europe with the 

 spruce and the silver fir ; the same idea has been employed by 

 Trevor in the regeneration of a mixed crop of deodar and blue pine. 



" It is only necessary to make a first seeding felling suitable 

 for the reproduction of deodar ; and thereafter to lighten the 

 overwood so that kail seedlings complete the crop." 



