22 



BULLETIN 1064, U. S. DEPARTMENT OF AGRICULTURE. 



With respect to per cent of yield as compared to amount of chip- 

 ping surface used up, the narrow method was markedly superior to 

 the other two methods. In 1916 it showed an increase in yield per 

 inch of height of face of about 40 per cent, and in 1917 of nearly 50 

 per cent, over the standard. 



The productivity of the trees on the narrow area at the end of 

 the second year of operation, even after a long period of dry weather, 

 was very high as compared with that of the trees on the double area. 

 Photographs of freshly cut streaks made immediately after chip- 



































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Apr MoyJune JuA/ Auq Jez>r. Oct. A'ok Dec' Adh MovJane July Aug. Sa/sr. Oct. /Vox Dec. 



Fig. 5. — Narrow trees, 191G. 



Number of tracheids, observed April to 

 December ; in 1916, growth ring. ° Sum- 

 mer wood present. 



Number of resin centers per unit area 

 (an arbitrary tangential extent ; diameter 

 o.f microscopic field by the width of the 

 annual ring observed). Observed April to 

 December, 1916 ; in 1916, growing ring ; in 

 1915, completed ring. 



ping are shown in Plate III, figures 1 and 2. The abundant exuda- 

 tion of the gum from the narrow-chipped tree shown, even under 

 adverse weather conditions, was so striking that the practical tur- 

 pentine operator who was managing many crops in that section, and 

 had been very skeptical of the narrow method of chipping, expressed 

 surprise and satisfaction at the excellent condition of the timber. 

 Not all the double-crop trees had " dry-faced " to the extent shown 

 in Plate III, figure 1, but many were in that condition, and the 

 yielding capacity was in general markedly reduced. 



