82 



If a V-cut be made and alternate day tapping practised 

 and if the tapper make 20 cuts per inch, then the 

 cutting surface will be moved one inch in 20 X 2 = 40 

 days ; in one year therefore, we get 360 ~ 40 = 9 inches 

 of advance ( l ). If therefore the terminal point is desired to 

 be 6 inches above the soil, the first cut should be made 

 at 6 plus 9 = 15 inches above the soil. 



When applying the single herringbone, the distance 

 between the parallel side cuts must be calculated in the 

 same manner (see fig. 28^). If the tapper make 25 cuts 

 per inch, and the tree is tapped every day, 25 days 

 should be taken for one inch of the bark. In one year, 

 365 + 25 or about H 1 /^ inches of the bark will be taken 

 away. If therefore the distance from a b is taken at 14^/2 

 inches, after one year the cutting surface aa' will be moved 

 to the line bb 1 ' , and bb' to cc' and so on ; in a year, 

 within a distance of 14^/2 inches between the tapping 

 lines, the whole quarter surface will be tapped off. 



If the tapping of renewed bark is desired to be com- 

 menced in four years, each quarter surface should be 

 treated consecutively in this manner, so that at the end 

 of the fourth year the whole tree will have been done. 

 If tapping has only been done every alternate day, 

 and other circumstances remain the same, then for one 

 quarter of the surface double the time would be taken, 

 i. e. two years and in that case two quarter surfaces 

 can be tapped together, for instance, first two opposite 

 surfaces, which will take two years, then the two remaining 



( 1 ) In this and the following examples, the numbers of days per 

 year are certainly too high; there are always some to be deducted for 

 feasts, rainy days etc. Although sometimes 365, 360 or 350 are taken ; 

 in reality 350 is the highest attainable figure. 



