318 BOTANICAL GAZETTE [NOVEMBER 
After the slopes have once been ‘predetermined,’ the increase 
seems to depend mainly on temperature, either directly or indirectly. 
It is thus possible to predict the moisture content of the buds for 
any date after the first of January to the time the pink petals of 
1.00 F 
-90F 
i 1920 
1921 
Jan, eae. Feb. Feb. Mar. Mar Mai 
26 £2 18 25 5. ii it ee 
I —Proportionate i increase in moisture content of eer buds (continuous 
nes) ne corresponding increases in remainder indices (dash lines), deta 
passe (dot lines), and exponential indices (dash-dot sins) for years 1919-1921 
the buds begin to show. The daily mean temperatures and the 
origin of the slope of the curve must be known. If the origin be 
considered the first moisture value with its corresponding tempera- 
ture summation after January 1, or after the end of the rest period, 
then the slope can be determined from one other later moisture 
determination. 
