19I51 



BROWN— PINUS STROBUS 



219 



crop out all along the bole of the tree. The data given in table I 

 illustrate this very well. They were computed from tree III on 

 June 17, 1 913. This tree was a vigorous specimen on the north 

 end of a small island in Fall Creek, east of Forest Home. The 

 height was 81 feet, the diameter breast height 21.5 inches," and 

 the age about 80 years. Exposure was to the southeast. Crown 

 development was good but one-sided, and greatest to the southeast. 

 Root development was also uneven, but the reverse of crown 

 development, because the constant washing of the water and the 

 mechanical action of ice had destroyed the root system on the east 

 side. The tree was felled on June 17, 1913, and a double series of 



TABLE I 



Extent of growth in tree m, June 17, 1913 



9 cuttings taken at intervals of 10 feet, one on the northwest side 

 and one on the southeast side (exposed). Careful average counts 

 were then made of the number of new formed tracheids, as well as 

 those in the preceding ring at each point. On June 17, 1913, growth 

 was more advanced in every cutting on the southeast side, the first 

 two cuttings excepted, than on the northwest side. This was to 

 be expected, because of direct insolation and larger crown to the 

 southeast. But in both series of cuttings marked vacillations in 

 growth are evident, so that it follows that growth irregularities 

 express themselves not only in a variability in thickness of tissue, 

 but also in the number of elements laid down. 



" Exceptionally high because of the buttressed base. 



