30 JOURNAL OF FORESTRY 



the cambium, and seldom shows the sinuous course so characteristic of 

 adventitious structures in the wood of maples and other broadleaf spe- 

 cies. The increased food supply induced by the thinning is also a factor 

 in initiating the growth of these buds. They are generally located at 

 the branch whorls, and they are capable of growth up to the period in 

 the life of the tree when very thick bark is produced. Consequently, on 

 the lower part of the trunk of the oldest trees these buds may die out. 



The data on the cut-over area show the average original crown size 

 for grand fir to be 901 square feet, with an average secondary crown 

 of 171 square feet, or a total average crown of 1,072 square feet. The 

 average size of the original crown for grand fir on the uncut area is 

 322 square feet, which leaves a balance of 233 per cent in favor of the 

 cut-over area. The uncut area is denser than the original cut-over area 

 by 20 per cent. The mean annual diameter growth on the cut-over 

 area for the period up to 191 5 is 176 per cent greater than a similar 

 figure for the uncut area. These figures plainly indicate the grand fir 

 on the uncut to be suppressed to a greater degree than was the original 

 stand on the cut-over area. 



The sporophore data (Table 2) exhibit an important contrast be- 

 tween the percentages of live and dead sporophores. On the cut-over 

 area only 14 per cent of the total sporophores were alive and 86 per 

 cent were dead, while on the uncut area 80 per cent of the total sporo- 

 phores were alive and only 20 per cent dead. In summing up the total 

 number of trees bearing sporophores on each area, it is interesting to 

 note that in the cut-over area 92 out of 375 trees, or 27 per cent, were 

 found bearing sporophores, while in the uncut area 65 out of 75 trees. 

 or 87 per cent, were found to bear sporophores. This result compares 

 with a like result obtained for hemlock, and gives further evidence of 

 the greater fungous activity to be found in the trees of the uncut area. 



In the cut-over area, out of a total of 375 trees, 180, or 48 per cent, 

 were found to be sound and 195. or 52 per cent, were found infected in 

 varying degrees. In contrast to these figures, out of a total of 75 trees 

 taken on the adjacent uncut area, none were found sound, giving 75 

 trees, or lOO per cent, infected in varying degrees. In the thinning 

 stand 48 per cent of the trees are free from infection. Out of a total 

 of 245 sporophores (dead or alive) produced on the cut-over area 86 

 per cent were found dead, leaving only a very small percentage living, 

 and these were found to be small and in every w^ay inferior in spore 

 production to the live sporophores of the uncut area. In this considera- 

 tion the drying effect of thinning upon the sporophores produced, as 

 well as the action of the direct light, tend to gradually check the devel- 



