Mar. 8, 1924 
727 
Acidity Changes during the Growth of Wheat 
The plants of the third series (C) were grown to determine whether 
the correlation shown by the graphs in figures i and 2 to exist between 
acidity of the juice and stage of development would appear if the plants 
were in a different environment. Seed of the same varieties was ob¬ 
tained from a different source 5 and sown on February 8 in another 
//V 
Fig. 2. —The titratable-acid concentration of wheat juice from plants of Series B,from the seedling to the 
late-flowering stage. (Greenhouse, Nov. 22, 1922, to Apr. 25, 1923.) 
greenhouse having unlimed, sandy-loam soil with a reaction of P H 6.8. 
The plants developed much more rapidly than those of the two preceding 
series. They reached the flowering stage in 14 to 16 weeks, whereas the 
plants of the same varieties in the fall-sown series had required 22 weeks 
to reach this stage. After 16 weeks, the plants no longer yielded the 
/ = Ys9Af7lS' /A/ 
Fig. 3.—The titratable-acid concentration of wheat juice from plants of Series C,from the seedling to the 
late-flowering stage. (Greenhouse, Feb. 8 to June 14,1923.) 
requisite amount of juice for titration except in the case of Kota where 
one later measurement was made. Some of the acidity values plotted 
in figure 3 were obtained from plants cut in the morning and others 
from plants cut in the afternoon, as indicated in Table I. . 
5 Seed of Kota, C. I. 5878, Preston 3081, Pentad C. L 3322, and Marquis C. I. 3641. for Series C was sent by 
M. N. Levine from University Farm, St. Paul, Minn., and Khapli C. I. 4013 and Little Club C. I. 4066 by 
Dr. E. F Gaines, from Pullman, Wash. 
