1915] BROW N—PINUS STROBUS 217 
subject are available. For the third the reader is referred to the 
publications of WIELER (37-39), JosT (13-15), R. anp T. Hartic 
(9-12), MiscHKE (24), and others. 
The amount of seasonal growth in an individual or of growth 
up to a given point in the season is equal to the sum of the products 
of the different prevailing growth intensities by the time each was 
in operation. It follows that these summations would be quite 
different in different parts of the tree. The only reliable method 
to indicate the amount of seasonal growth at a given point and at 
a given time is as a percentage of the previous year’s ring. Even 
this is open to criticism, in that the annual increment often varies 
between wide limits from year to year. Yet general deductions may 
be drawn from data of this kind which will indicate to some extent 
at least the amount of growth at definite times. Table H was made 
with this idea in view. The figures were obtained from tree I. 
The width of the previous year’s ring represents the average of the 
last formed rings as exhibited in the 6 different cuttings.” 
TABLE H 
AMOUNT OF GROWTH IN PERCENTAGE OF PREVIOUS YEAR’S RING, TREE I 
No. 4-26-13 | 5-42-13 | 6-12-53 _ | 7-3-~33| 8-13-13 | 9-10-13 sc ag see 
| acer eae teut 3 16.0 26.0 Bye Ce ee 4471.7 
ee ae 0.7 75% 28.9 34.6 | 96.0 3535-3 
a an 18.0 | 50.2 78.9 | 93-5 89 2019.4 
MSL aman ek 0.90 11.8 60.4 58.8 99 lea sigs 2071.7 
On April 26 the greatest proportion of new growth occurred 
in cutting III, with cuttings I, IJ, and IV following in the order 
named. On May 12 the order remained the same except that 
cuttings I and II had interchanged. On June 12 the ring was, 
theoretically at least, from one-fourth to over one-half complete; 
on July 3 from one-third to over two-thirds complete; while on 
August 13 seasonal growth was over four-fifths complete in all 
cases." After the last named date, the growth was very sluggish 
* The last acts as a control and tends to eliminate error. 
- ™ Growth ceased in cutting I after July 3, 1913; see table F. 
