208 BOTANICAL GAZETTE [MARCH 
thickening had not begun in the new tracheids, but was noticeable 
in the first of the new sieve tubes. Cutting II exhibited only 
slight evidences of cell division, while in cutting III growth was 
well started. No division had yet occurred in cutting IV. Growth 
had been very rapid in cuttings I and III, as evinced by the absence 
of thickening of the cell wall. This may be accounted for in part 
by the high temperatures which prevailed between April 22 and 26. 
During that period the mean daily temperatures ranged from 52° 
to 70° F. Precipitation amounted to only 0.03 inch, but large 
amounts of ground water were available at that season. 
TABLE C 
BEGINNING OF GROWTH BY CELL DIVISION, TREE I, APRIL 26, 1913 
Cutting Growth Mame deFng Wall thickening |New sieve tubes 
De eae he ee ee Present 8-12 None a4 
pees a Sk nen rer ee eat Indication oI None o-I 
Ee eee eae Present 6- 9 None | 1-2( ?) 
DV ise iy tase ete ae one ° None fe) 
To explain plausibly the conditions in cutting II, the point of 
greatest growth the preceding season (table H), is not an easy 
task. Every indication seems to show that we might expect most 
rapid growth at this point. We can conclude only that the 
restricted growth here denotes one of the many idiosyncrasies 
of tree growth, where, as pointed out by WIELER (38), marked 
differences may occur in closely neighboring spots. It is to be 
expected that growth would not be manifest in cutting IV at this 
early date, so we may conclude that in tree I cell division was in 
evidence on April 26 in the upper portion of the bole but had not 
yet begun at the base. 
In order to check the results on tree I, four bole cuttings, 
including the terminal leader and four branch cuttings, were made 
on a neighboring tree on May 4, 1913, eight days later. Tree Il 
stood about 1o feet from tree I, and was apparently of the same 
age and subject to the same silvicultural conditions. The extent 
of growth and lignification in this individual is given in table D. 
