* 
1915] BROW N—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, 1913. 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 II, JUNE 17, 1913 
N.W. spe S.E. SIDE 
Currine PERCENTAGE PERCENTAGE 
Tracheids in | Tracheids in Tracheids in | Tracheids in 
old ring new ring old ring new ring 
Sa 55-65 20-25 0.38 55-65 20-25 0.38 
Sree eae: 32-34 15-18 0.52 30-35 15-17 0.48 
1 ee ee 22-24 II 0.43 3 18-20 0.63 
5 Series eae o3*35 10-12 0.46 22 17 9.77 
pat ee 16-18 6- 8 0.41 Ig-21 1-15 0.70 
Lf Ca Ree 16-18 6-7 0.35 23-25 14-15 0.63 
fi 15-16 7-10 0.60 12-14 0.69 
WE ce fc 12-14 0:61 9- 6- 8 0.64 
Se segs 12-14 c7 °.40 12-14 ZO 0.62 
9 cuttings taken at intervals of ro 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. 
