1922] JOHNSTON—PEACH BUDS 317 
A general survey of the temperature indices in table I at once 
shows that the 1920 season was colder and less advanced by April 1 
than those of 1919 and 1921 on March 28 and March 11, respec- 
tively. If the sum of the daily mean temperatures above 43° be 
used as the criterion, it is seen that the season of 1921 was more 
advanced on February 18 than the 1919 season on March 7, and 
the season of 1920 on March 22. The moisture content of the fruit 
TABLE II 
MoIsTURE CONTENT OF PEACH BUDS WITH CORRESPONDING TEMPERATURE INDICES 
FROM JANUARY I OF EACH YEAR, EXPRESSED AS NUMBERS RELATIVE TO 
EACH SEASONAL RANGE, FIRST AND LAST VALUES BEING 0 AND I.00 RESPECTIVELY 
| MolstuRE TEMPERATURE INDICES SUMMED FROM JANUARY I 
DatTE 
Ratio of water oa 
Daily mean Physiological Exponential 
Solent ol Sy above 43°F. index index 
I9IQ 
Mpa Gd ese wee Cand ° ° ° ° 
POCRUEIY Fi ikki Weenies 0.05 05 0,12 0.23 
SICH Fos t'es:. ehh ks gone 4h 0.31 0.26 0°. 36 0.50 
MOURN BB oy a cas I.00 I.00 1.00 I.00 
1920 
rpm ee Nee ge Oye ° ° ° 
Eck eeatoe ea beat 0.01 ° 0.04 0.12 
PAUNCN 88. a VE es 0.27 Oi 5% 0.37 0.51 
Beek es I 1.00 I.00 I.00 
ied BO eek ri ° ° ° ° 
WOTORIY T2.o6oe 0.07 0.03 0.06 0.17 
Wemmueary 28.0 es 0.15 0.17 0.19 0.32 
WOMUASY 86. 55 is dae ss 0.16 0.17 0.19 0.32 
Ma 8 eee 0.32 0.34 0.33 0.54 
MAIC PE iis es 0.76 0.80 0.84 0.86 
BUR S40 oe 4 ee I 1.00 I.00 I.00 
buds on January 26, 1921, was practically the same as that on 
February 7, 1919, and somewhat greater than that on March 2, 
1920. Such early development of buds increases the danger of 
fruit loss by spring freezes. 
The moisture values given in table I have been plotted against 
the summation values of the daily mean temperatures above 
43° F., and are presented in fig. 1. The slopes of the 1919 and 
1920 curves are practically the same, while that of 1921 is quite 
different. There are apparently some conditioning influences at 
work before January 1 that determine the slopes of these curves. 
