1905] LIVINGSTON—TRANSPIRATION AND GROWTH 185 
relative amounts of manure, leaf area, and weights of leaves and of 
tops. Here the two lower curves are again nearly horizontal lines. 
There is a slight tendency for transpiration per unit area to increase 
with increasing soil fertility, but this tendency is hardly shown at all 
in case of transpiration per gram, 
32, Series IV, V, and VI.— 
oe: These are duplicates of I, 
“ ‘JI, and HI respectively, 
carried on at the same time 
z6z, and in the same place. 
s While the three already de- 
scribed are based on a single 
basket of each treatment, 
1.43 
36 —— igs r 
A 
those here presented are 
based on four baskets, con- 
plants. Only transpiration 
and green weight of tops are 
considered; the other deter- 
See were not made 
ere. 1.00 
—————— til 
Curves for these three © 2. 2 “8 : 
Fic. 7 
series are given in jigs. 7, 
8,and9. In fig. 7 it is to be noted that culture 6, containing 30,000 
P-P-m. manure in the Takoma soil, shows a discrepancy which was 
not found in Series I, of which this is a duplicate. No reason for 
Ses can be given. It is obviously due, however, to soil conditions, 
Since the curve of transpiration follows closely that of weight, both 
exhibiting the same drop for culture 6. 
