OLEORESIN PRODUCTION. 25 



judging from the wood formed by the round timber, was not such a 

 favorable growing year as 1916. Hence it would appear that the 

 narrow method of chipping not only permitted a nearly normal 

 wood production but also a very marked increase in resiniferous 

 tissue. 



It is greatly to be regretted that the same operation could not have 

 been continued for at least two years longer, in order that still fuller 

 results from this very promising method might have been secured. 

 In this regard it is of interest to compare the results obtained from 

 an earlier Forest Service experiment, and likewise those from the 

 Florida National Forest, where the chipping is only slightly wider 

 than that actually used on the narrow tract and where this method 

 has been practiced successfully for a period as long as six years. 

 Information clearly indicating the advantages of narrow chipping 

 has also been gleaned here and there from conversations with observ- 

 ing and experienced practical turpentine operators. This evidence, 

 in addition to the positive evidence presented as a result of the pres- 

 ent study, definitely points to the importance of further practice of 

 the method, to the end of obtaining conclusive results on a large scale 

 and over a period of four or more years. It is especially desirable 

 that data from narrow chipping on small young timber should be 

 secured. 



STANDARD FOREST SERVICE METHOD OF TURPENTINING. 



The method of turpentining practiced on the Florida National 

 Forest is designated as the " standard Forest Service method." 24 

 In the Forest Service leases issued to those who rent timber for the 

 purpose of turpentining, the following requirements were made, 

 subject to inspection by forest officers during the operation of the 

 permit. All unmarked living trees 10 inches and over in diameter, 

 breast-high, were cupped with not more than one face on trees 10 

 inches to 15 inches in diameter; with not more than two faces on 

 16-inch to 24-inch trees; and with not more than three faces on any 

 tree. It was customary to make the first streak of a virgin opera- 

 tion when the aprons were placed, some time before the regular 

 chipping begun. A No. 1 or smaller hack avus required for chipping. 

 Barb bars at least I inches wide Avere to be left between faces. The 



dimensions of the weekly streak specified were that if should be not 

 more than one-half inch deep (not including the hark) and not 

 more than one-half inch high. In practice the height cut never 

 exceeded "in- half inch, mid on the uresis observed spmetjunes tended 



to be slightly less. A total of qo! more flnin in inches in height 



'Data obtained chiefly in 1016 and 1917 through the courtesy <>r Supervisor i. IT. 

 Bldredge and Deputy Supervisor D. B, UcKee, and in 1921 from Supervisor L. L, Bishop, 

 nil i.f tin- Fori mi Service, 



