116 ALLOCATION 01" FELLINGS. 



The Third Kule fdr locating coupes requires that they should 

 succeed each other in the direction contrary to that of dangerous 

 winds. Thus while the First Eule compels the Amenagiste to 

 make his cuttings succeed each o-ther on the ground in the order of 

 their age, the Third Rule prescribes the direction in which they 

 should so follow each other. The winds here referred to are such 

 as, are dangerous, either by their violence, or by the steady manner 

 in which they blow, or by the moisture which they bring. The 

 chief object, which this Rule is designed to secure, is to afford the 

 necessary shelter to reserved trees left standing far apart in 

 High Forest Regeneration Coupes by the exploitation of those 

 surrounding them. But even the, so to say, ramparts formed by lofty 

 canopied high forest, are not, once they are breached by the 

 exploitations, proof against injury from winds, unless the latter 

 have no access to them. If, therefore, dangerous winds blow froni 

 the South- West, this rampart must be opened by the exploitations- 

 only on the North-East side. If such- winds come rushing down a. 

 valley, the coupes should follow each) other from below upwards.^ 



The Third Rule may thus compel the Amenagiste to modify 

 the succession of the cuttings that he may have adopted in any 

 group of corapartments before considering it, and the modification 

 may go so far as to completely reverse the order of the succeaeive 

 exploitation.s first determined upon. Indeed, it is easy to conceive- 

 that the circumstances of the case may be such that without so- 

 reversing the order originally chosen, it weuld be impossible to 

 satisfy, at one and the same time, the requirements of both the 

 First and Third Rules, while still satisfying the conditions of the 

 Exploitability adopted. 



The Third Rule for locating coupes is of universal appli- 

 cation both in hill and mountain, and in plain forests. It is not 

 only useful for the preservatian of standing forest, but it also' 

 favours reproduction and growth in many ways. Shelter, often a* 

 necessity, almost always of great utility, exercises its action a 

 considerable distance off. In level country this action is felt over a 

 belt of ground, the width of which is 20 times the height of the 

 sheltering object. Thus a mass of canopied forest 80 feet high- 

 protects from the wind the adjoining land over a breadth of 1,600 

 feet. The beneficial effects of shelter are as great as the injury 



