200 STORRS AGRICULTURAL EXPERIMENT STATION. 
Explanation of Tables 38 and 39. — Table 38 gives analyses 
of samples of soy bean seeds from a series of special nitrogen 
experiments similar to those carried on with cow pea fodder. 
hese experiments include two plots without fertilizer, two 
plots with mineral fertilizer (phosphoric acid and potash) only, 
three plots with nitrate of soda and mineral fertilizers, and 
three plots with sulphate of ammonia and mineral fertilizers. 
ihe analyses include only samples of the seed, as the vines 
dropped their leaves almost entirely before the seed was fully 
ripe, making it impracticable to sample the straw. The table 
shows the kinds and amounts of fertilizing materials and the 
quantities of nitrogen used, the kind of experiment, and the 
percentages of the various food constituents on the basis of 
water-free substance. The average composition of the crops 
from plots having the same kinds and amounts of fertilizers is 
shown in bold face type, which figures are used in the summary 
Table 21 on page 150 of the text. 
Table 39 gives the yields per acre of water-free substance, 
and of the various food constituents. The yields of water-free 
substance were calculated from the total weights of the seed 
when the crop was threshed, and the proportion: of water-free 
material found in the samples of the seeds at that time. The 
yields of food constituents were obtained by multiplying the 
weights of the water-free substance as shown in Table 39 by 
the percentages of the various food constituents as shown in 
Table 38. The average yields per acre of crops grown under 
similar conditions are given here in Table 39 in bold face, 
which figures are used in the summary Table 23 on page 153 
in the text of the article. 



