258 ELEMENTS OF SYLVICULTURE. 



contractors are bound to observe when they purchase 

 the right of resin-tapping, there is a clause which 

 fixes a maximum of five inches for the breadth of 

 the quarre, and a maximum of two-fifths of an inch 

 for its depth. 



Only one quarre at a time ought to be worked in 

 those trees which are not to be felled in the next 

 thinning operations. To prolong their existence, it 

 would even be desirable to make the quarre only 

 three inches wide. The same quarre is worked for 

 five years by the process explained above of freshen- 

 ing and lengthening the wound. During the first 

 year it is lengthened by twenty-two inches ; during 

 each of the three succeeding years by twenty-six 

 inches ; and during the fifth year by twenty-eight 

 inches. At the end of this term a new quarre is 

 opened, which is worked in the same manner. This 

 process is repeated until within a few years of the 

 felling of the trees so tapped, when the process called 

 gemmage d mort is employed. 



No tree is tapped in the manner we have just de- 

 scribed before it has attained a circumference of 

 three feet. M. Lamarque is of opinion that it 

 would be better at the beginning to work a quarre 

 for only four years, and then give the tree rest for 

 one year. The quarres when left alone, soon heal 

 up by the formation of new rings of wood and bark. 

 After some time a new quarre may be opened in the 

 swelling formed by the bark immediately over the 

 old quarre. 



. The swelling is a sure indication of the existence 

 of an old quarre under it, and some old trees maybe 



