igof\ Herty — Production of Turpentine. 119 



were discontinued and the results published by the Bureau of 

 Forestry as Circular No. 34 entitled "Practical Results of the 

 Cup and Gutter System of Turpentining". The summary of 

 these results shows the total value of the products (spirits of 

 turpentine and rosin) trom three years of operation to have 

 been from 



the cupped half-crop $2,688.55 



the boxed half-crop 2,046.53 



Gain from cupped half-crop $ 642.02 



an increase of about 32 per cent over the "box" system. 



The results of the first year of operation of these two half- 

 crops, during- which time conditions were identical in each 

 except that in one half crop "boxes" had been cut in the trees, 

 showed an increased yield from the unboxed trees of 23.5 per 

 cent., thus confirming the hypothesis that the cutting of the 

 box decreased the productive power of the tree. 



The publication of these results has resulted in the com- 

 mercial introduction of the system on a large scale, and in 

 many cases the results obtained with the apparatus have 

 exceeded those obtained in the experimental tests. 



But the introduction of the cup system cannot of itself save 

 the forests of Longleaf Pine from destruction. If too great a 

 proportion of the circumference of the tree be removed in 

 scarification, or "chipping" as it is termed, the tree will die 

 whether a "box" has been cut or a cup hung. Further exper- 

 iments have, therefore, been begun by the Bureau of Forestry 

 to determine to what extent the wound given in "chipping" 

 can be decreased in width, height and depth without decreas- 

 ing the production. It is possible that by moderate reduction 

 the production may even be increased. These experiments 

 are now in progress. 



