Plate VI 



Fig. 1.— Cross section, cut April 24, 1916, from the peak, about 6 feet above the ground, of one of the trees 

 shown in figure 4. The effects of 2 years of heavy chipping are manifested, even in this vigorous 

 timber, by reduction in width of ring and in amouni and density of summer wood in the 1914 and 1915 

 rings. More resin passages than usual are present. The effect of the wound is apparent in the wood 

 f jrmed 6 feet above it in the 1914 ring. No wood formation for 1916 had occurred. Material from near 

 Bogalusa, La. 



Fig. 2. — A boxed tree heavily chipped for five years. Wood structure shown in figure 3. Tree near Florida 

 National Forest. 



Fig. 3. — Specimen cut from the peak of the tree shown in figure 2, about S feet above the ground. The 

 response to turpentining is apparent in reduced wood formation in the five annual rings next the bark 

 (top). The effects in the ring formed when turpentining was first begun were produced about 8 feet 

 above the wound. The specimen was cut in May, 1916. No wood formation for that year was yet 

 apparent. 



Fig. 4. — Timber of which the specimen shown in figure 1 is an example. 



Fig. 5. — Very heavy chipping was used on this small tree for 3 years. The wood formation was markedly 

 reduced. The specimen was cut May 6, 1916. No wood formation for that year had occurred. 



FlO. 6. — Specimen from a conservatively chipped small tree. (Second year of' turpentining by the French 

 method.) This tree is from the same locality as the specimens shown'in figures 3 and 5. Here, however. 

 ~> or i) rows of wood cells and one series of resin passages were already formed by May 6, 1916 (top next 

 bark;. In 1915, the first year of turpentining, summer wood formation was not reduced In this specimen. 



