214 . BOTANICAL GAZETTE [MARCH 
gained, however, by comparing the average growth intensities for 
different periods in the growing season. It follows that the shorter 
the intervening time periods, the greater would be the vacillations 
in the data. With this idea in view table F was constructed. 
It includes figures of growth intensity from tree I during the summer 
of 1913. The width in microns of the new growth is given for 6 
different periods, together with the total increase from period to 
period and the average gain per day. The last will give, not the 
actual, but the average intensity of growth of the period just 
preceding. 
If the data of April 26 and May 12 are compared, the following 
points are to be observed. The average growth intensity was 
greatest in cutting II, with cuttings I, III, and IV following in the 
order named. On June 12, 31 days later, cutting IV exhibited the 
greatest average growth intensity, with cuttings III, I, and Il 
following in the order named. Again, in the cuttings of August 18 
and September 19, different combinations occur. At the first 
named date, growth was more rapid in cutting II, while at the 
latter date it was in cutting IV. 
TABLE F 
GROWTH AMOUNT AND INTENSITY, TREE I; SEASON I913 
Amount | No. of : Gai A No. of F Gain 
No Eres, ne devs Gain war day Recs et ans Gain per day 
Tete T7OIO BE Soot ta ee ee 716.3K) 16 546.34, 34.14 
Bea ceOr | GOO (Pies esa eer ued soe oats 609.6 16 583.0 | 36-5 
Se OO er ee ee 472.4 16. | 365.7 | 22-9 
P epeeare OO ee eae a re i, 243.8 16 243.8 15-2 
.6-12~"13 jas 
LB aide (1164.2 at 447-90H| 14.4) 2176.0m@ 21 rorr.8m@ 48.2h 
2.6, 1AOgt: 31 41l.5 ¥3,2 |. 7234.6 21 202.9 9-7 
ne | 1414.3 31 941.9 30.4 | 2067.2 21 652.9 | 31-9 
Bao 1251.2 31 1007.4 32.5) | 225G.2 Oe eee Sere ed 
| 
| | 
8-13-7113 | 9-19-13 bye eg 
Po; 2176.04 41 : 0.0) 2176.04] 37 0.0#, 0.0 
eco. 3100.8 4I 1876.8 47.5 | 3304-6 37 293.8 194 
ca 2448.0 41 380.8 9. 2339.2 37 pees eo 
Peek 2067.2 41 848.0 20.7 | 2502.4 37 435°2., 
