120 PRACTICAL FOREST MANAGEMENT. 



the working circle, all these matters must be lucidly explained. 

 In cases like chir, where the standard system is well-known and 

 published, papers are available ; it is not necessary to repeat such 

 information in working plans. The best information available 

 at the present moment for the different species is given in the 

 form of extracts from existing working plans. 



Sal' 46 The system adopted is the uniform or shelterwood system, 



robwrta) founded on Collier's Haldwani practice, since modified in the light 

 of experience gained. Mr. Collier's theory is given in the follow- 

 ing paragraphs : 47 " Very little knowledge has yet been acquired 

 as to the conditions which are most favourable to the production 

 of sal regeneration or as to the subsequent development of seed- 

 lings. Undoubtedly the finest uniform crops of sapling and poles 

 are to be found over areas in which the overwood has been very 

 heavily felled in the past. But while the instances of thj kind 

 indicate the desirability of heavy fellings over regeneration already 

 on the ground, yet there is no evidence to show whether this 

 regeneration appeared as a consequence of these heavy fellings 

 or whether it was present at the time of the fellings. Apart from 

 the necessary combination of seedfall and rainfall and assuming 

 that the seed is fertile, the two determining factors in the 

 production of regeneration must be conditions of light and soil. 

 Light depends on the degree of heaviness of the fellings and it 

 would seem an easy matter to determine its influence by an 

 inspection of the forests. The theory that a large measure of light 

 is necessary for the reproduction of sal will find support every- 

 where in the many blanks which are filling up with regeneration, 

 but will fail to account for the absence of regeneration in certain 

 forests. On the other hand there is equally strong evidence to 

 prove that regeneration will also appear in great quantities under 

 extremely adverse light conditions. Light appears to be of 

 secondary importance in the regeneration of sal and a heavy 



41 'Dthra 'Dun Working Won BHOLA. 

 "Haldwani Working Won. COLLIER. 



