GROWTH STUDIES IN FOREST TREES 
2. PINUS STROBUS L. 
H. P. BRowN 
Object and scope of the investigation 
(WITH PLATES XIII AND XIV AND TWO GRAPHS) 
The present paper is the second of a series presenting the 
results of studies of growth in forest trees.t The investigations 
are planned with a twofold purpose, namely to clear up some dis- 
puted points regarding the formation of annual rings and to out- 
line the laws of growth in trees. The results of the studies of 
Pinus Strobus L. are presented in this paper. 
Pinus Strobus L. (white or Weymouth pine) was chosen for the 
second subject of investigation for several important reasons. 
First, it is a soft pine and differs from the hard pines, which include 
Pinus rigida Mill., both in external as well as internal anatomy. 
Further, it is more rapid in its growth than pitch pine, and inter- 
esting results were anticipated from a comparative study of the 
two trees. Finally, white pine is of recognized commercial impor- 
tance, and it is hoped that some of the conclusions will prove of 
interest and value to foresters. 
The specimens in the investigations, aside from the seedlings, 
were all in the wild state. The investigations were not limited 
to a few trees or to one locality. Specimens were examined in 
different woodlots, thereby providing variation in site, soil, and 
other silvicultural conditions. Seedlings from the nursery beds 
of the Department of Forestry, N.Y. State College of Agriculture, 
Cornell University, small trees from the same, as well as others in 
the wild state, and older trees which had passed the century mark 
and presented wide variation in crown development, were all sub- 
jected to examination. Fully 50 specimens were studied and from 
them comparative data were secured. It is hoped that the results 
thus obtained will prove of permanent value in formulating general 
e first paper appeared in Bor. Gaz. 54: 386-403. 1912, and included the inves- 
si ciice upon Pinus rigida Mill. 
197] [Botanical Gazette, vol. 59 
