TAPPING 



163 



be obtained from a very moderate paring of the bark as from 

 the most drastic cutting. In both cases an eight-year period 

 for the thorough renewal of the bark is easily obtainable. 



The following extract is from the circular describing the 

 experiments : 



" The experiment described was carried out on seven rows 

 of ten trees each. The trees are old and closely planted. The 

 rows are numbered I. to VII., and tapping was carried out on 



FIG. 43. Broad V System of Tapping. 



the system described in the circulars, in the same way on all the 

 trees, except that the interval between successive tappings was 

 different for the different rows. The following table shows the 

 average interval in days between successive tappings, and the 

 number of years allowed for renewal on the system adopted: 



Interval 



Period of renewal 



I. 

 1.4 



2-3 



II. 



2.6 

 4 



III. IV. 



v. 

 6-5 



VI. 



7.8 



9 



VII 



9.0 days. 



years. 



10 



" The average yield per tapping of ten trees is given in 

 grammes in the following cable, which covers he last six months 



