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 began. A No. 1 or smaller hack was required for chipping. 
Bark bars at least 4 inches wide were to be left between faces. The 
dimensions of the weekly streak specified were that it should be not 
more than one-half inch deep (not including the bark) and not 
more than one-half inch high. In practice the height cut never 
exceeded one-half inch, and on the areas observed sometimes tended 
to be slightly less. A total of not more than 16 inches in height 
24 Data obtained chiefly in 1916 and 1917 through the courtesy of Supervisor I. F. 
Eldredge and Deputy Supervisor E. R. McKee, and in 1921 from Supervisor L. L. Bishop, 
all of the Forest Service. 
