U. S. DEPARTMENT OF AGRICULTURE, 

 BUKEAU OF FOEESTRY-Circular No, 34, 



GIFFORD PINCHOT, Forester. 



PRACTICAL RESULTS OF THE CUP 



SYSTEM OF TURPENTINING. $EP 2 ] 



By CHARLES H. HERTY, Ph. D. Division of Forestry 



University of California 



INTRODUCTION. 



The cup and gutter system of collecting crude turpentine, proposed 

 as a substitute for the box system commonly in use, was described at 

 length in a former publication. 05 The saving that it effected was also 

 shown in the experimental tests, the results of which were given at 

 the same time. 



Since the publication of the bulletin, experimental and comparative 

 tests have been carried on steadity, but only the results of a year's 

 commercial test of the new system on the turpentine farm of Messrs. 

 Powell, Bullard & Co., at Ocilla, Ga., have been published. 



This circular is issued to show the practical results of three years' 

 working of the new system, to call attention to several improvements 

 that have been made in equipment and methods, and to point out sev- 

 eral faults that have developed. All the comparative tests were made 

 on similar half crops as described in Bulletin 40. Readers who are 

 not familiar with turpentining are referred to that publication, but it 

 may be said in general that in this system the resin is collected in a 

 suitable vessel, preferably of hard burned clay, being caught and con- 

 ducted to this vessel by inclined metal gutters inserted in shallow cuts 

 in the tree. 



The advantages claimed for the system were two: First, that it pro- 

 tects the tree against the destructive action of storms and fire; second, 

 that it increases both the quality and the quantity of the product. 



RESULTS. 



Since the publication of Bulletin 40 the plot of timber there described 

 as a "first-year crop" has been worked two years more, as a ''second- 

 year crop" and as a "third-year crop," complete records being kept 

 of the yield from the "boxed" and "cupped" halves of the crop, 

 together with careful studies of the condition of the trees in each. 



Messrs. Powell, Bullard & Co. have courteously furnished the 

 results of the second and third years of operation. Summaries of these 

 figures are given in Tables 1, II, and III. They show that the cupped 

 trees yielded $1,284.04 per crop, or over 30 per cent, more than the 

 boxed trees. 



Bulletin 40, Bureau of Forestry, U. S. Department of Agriculture. 



(1) 

 29719 No. 3405 



