45 



The writer is not willing to generalize too hastily from so few results and consider them as a 

 solution of the problem. A large number of aualyses devoid of the possibility of chance selection 

 of samples is lu^'cssary b(!fore a positive or a negative answer can be given to the queslion, Does 

 the tappiug of trees for turpentine attect the subsequeut chemical comxjosition of theheartwoodi! 



But, however few in number the results are, they admit of the following couclusious: 



(1) Trees that have been tapped can still contain very much turpeiitiue in the hcartwood. 



(2) Trees that have beeu abandoned for only one year before felling can contain fully as much 

 turpentine in the heartwood as trees that have been abandoned for five years. 



(3) Trees that have not been tapped at all do not necessarily contain more turpentine in the 

 heartwood than trees that have been tapped. 



The accompanying diagram (page 46) serves to show what proportion of each disk was involved 



in each of the detail aualyses, and the results in each (;ase. The right-hand vertical line represents 



the pith of the tree, the horizontal lines represent the radial extension of each disk as numbered by 



ronian number, the position of the disk in the tree being maintained as in natuie, IV being the top, 



II the lower, and III the intervening disk. The subdivisions of radii represent the actual divisions 



of the disk to scale of one-half natural size, the portions to the left of the heavy subdivision line 



representing sapwood .s 1 and s 2; the portions to the right hcaitwood hi,h.,, divided according to 



the method as indicated on page 41. The four columns of figures over each disk piece represent 



results pertaining to that piece; they stand in order from the top for (1) number of rings, (2) 



T 

 volatile hydrocarbons, (3) rosin, (4) ratio ^ ; (2) and (3) as calculated on wood free from moisture. 



For instance, for tree No. 53, disk IV, s 2, we find — 



40 =Nniiiber of rings. 

 0.40 =Per cent of volatile hydrocarbons. 

 3. 81 = Per cent of rosin. 



10.37 = -^. 



