Diameter increase; one space = 230 
218 BOTANICAL GAZETTE [MARCH 
for the next 37 days. Though still in evidence at the end of that 
time, we may infer that the ring was to all purposes complete. - 
The contents of table H are presented in graph 2, where the 
abscissas represent the diameter increase of new growth and the 
ordinates 8 day periods. It is to be seen from both the table and 
the curves that in the long run the cambium in all parts of the tree . 
-tends to even up irregularities which arise from different growth 
intensities. If growth is sluggish at one place in the bole and rapid 
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One space= 8 days 
Grapu 2.—Curves of growth amount, tree I, 1913 
in another during a given period, the pendulum of growth intensity 
swings to the other extreme in the next period and evens up the 
disparity. 
The irregularities of growth are manifested not only in the 
actual dimensions of the new formed tissues, but in the number of 
new xylem elements as well. If careful average counts of new 
formed tracheids are made, and these compared with the average 
number of tracheids at that point in the preceding ring, irregularities 
