Plate V 



In each case the specimens came from the Columbia, Miss., tract and were cut midway between the 

 shoulder and the peak at the streak. The bark is shown at the top of each figure. The two annual rings 

 next the bark (top) were formed during turpentining in 1916 and 1917, respectively. The other rings 

 (below) were formed by the unturpentined timber. In all figures the greatest number of resin passages 

 is present in the rings formed after turpentining. 



Specimens from the Double-Chipped Area Cut November, 1917 



Fig. 1. — Marked reduction in ring width and amount of summer wood accompanying turpentining. This 



was generally greatest in trees with vigorous wood formation. 

 Fig. 2. — Tendency to increased ring width in 1916 but reduced summer wood formation. Both ring width 



and summer wood were reduced in 1917. At this height resin passages are present earlier in the 1917 



spring wood than in that of 1916, where probably short resin passages, formed in 1916, have been cut 



away by chipping. 



Specimens from the Narrow-Chipped Area 



Fig. 3. — Specimen cut November, 1917. The 1916 and 1917 rings are both wider than the rings formed 

 during the three years previous by the unturpentined timber. The 1917 ring is somewhat wider than 

 the 1916 ring, showing the sustained vitality of the tree in spite of turpentining, and cf a poorer season 

 in 1917. 



Fig. 4. — Specimen cut July 24, 1917. Here also sustained vigor associated with this rather conservative 

 method is apparent. Note the closed condition of the resin passages. 



