1915] BROW N—PINUS STROBUS 223 
results obtained from two cuttings in 1912 and the last two cuttings 
of 1913. The table is of value because it offers comparative data 
which are strongly correlated with the results of others. While 
the periods of time between the cuttings of rg12 and 1913 are 
different, it is obvious that in each year the greatest increase of 
xylem toward the end of the growing season was in the basal cutting. 
In other words, growth continued vigorously at the base of the shaft 
until well into September, while in the higher parts it had either 
TABLE K 
TERMINATION OF GROWTH, TREE I; I9I2 AND IQI3 
WIDTH OF RING PERCENTAGE 
Currine pode sinapncainpic No. or pAys | OF DAILY 
Aug. 5, 1912 |Sept. 26, r9r2 enone 
are 2643.8@| 3176.9@| 533.1H 20 52 0.38 
Sree tay eS pia gee Wig) Daa ple ala (ue eo ose Wat pai eg aM 52 SSia age 
Pe 2529.6 2622.1 92.5 3-6 52 0.07 
Fell aetna 1550.4 Bran 2 777-9 59 52 0.96 
Aug. 13, 1913|Sept. 13, 1913 
| eeaentens BEVOOR) -8090-G ls ios ee oes C\ Gome Perea rua 
LN Sage iethee a 3100.8 3304.6 293.8¢ 9-5 31 lao 
Sere ek, 2448.0 SERBS es ois ee kes CS Oa, ana ee 
ieee ee 2067.2 2502.4 435.2 21.1 3r 0.68 
totally ceased, as in cutting I, 1913, or continued very sluggishly," 
and this condition was exhibited by tree I during two successive 
years. 
It follows from the preceding paragraph that in normal white 
pine trees growth is apparently first retarded above, retaining its 
vigor longest in the basal portions of the bole. The results of others 
on coniferous species lead to the same general conclusion. T. 
Hartic (12) worked on both hard and soft wood trees and came to 
3 The disparity in the data of cutting I for the two consecutive years may be 
questioned. In ro12 there was an apparent gain of 20 per cent during the period 
intervening between the two dates given, while in 1913 no growth was evident at all 
after the first date. But in 1912, the first cutting was made on August 5, while the 
following year it was 8 days later. This probably accounts for the jncrease in the first 
case. Growth was still in evidence there on August 5, but had the cutting been 
made 8 days later, the results might have been decidedly different. 
