54 ° 
Journal of Agricultural Research 
VoL VII, No. la 
In Table III are given the data for the experiment with potted cab-, 
bage plants. This table presents first in a horizontal section the summed 
transpiration quantities for each plant and the average for the plants 
in each series. It also gives the green and dry weight values for each 
plant and the average for the plants in series A' and in series B. This 
section is followed below and in the order here given by (i) the ratios 
between the average transpiration quantities of the two series for the pe¬ 
riods before and after spraying; (2) the ratios between the quantities 
representing the average water loss per gram of green substance, of the 
two series in periods before and after spraying; and (3) the ratio between 
quantities representing the average water loss per gram of dry substance, 
of the two series in the periods before and after spraying. The differ¬ 
ence between the two ratios in a pair, on the same horizontal line, is 
given to the right. The plus (+) sign following the difference indicates 
that the ratio for the period after spraying is higher than the correspond¬ 
ing ratio for the standardization period. 
Table; III. — Effect of Bordeaux mixture on the rate of transpiration of potted cabbage 
plants 
[Period before treatment, Mar. i to Mar. 3; period after treatment, Mar. 4 to Mar. 17, 1916] 
Plant No. 
Transpiration quantities. 
Green weight 
of tops. 
Dry weight of 
tops. 
Period before 
treatment. 
Period after 
treatment. 
Series 
A. 
Series 
B. 
Series 
A'. 
1 Series 
1 B - 
Series 
A'. 
Series 
B. 
Series 
A*. 
Series 
B. 
(A) 
< 5 ) 
(A') 
(B) 
(C) 
«?) 
(£>) 
(&) 
67.6 
33-4 
IOIS. 2 
342.1 
56.48 
36.92 
10.48 
6.15 
46.5 
32-7 
709.O 
523*9 
58. 28 
39* 18 
8.98 
7 * 70 
71.1 
36.1 
1041.9 
493*3 
58.81 
40.72 
10.90 
6.20 
4 . 
42. 6 
30 . 7 
642.4 
585*5 
42.82 
38.11 
7* 74 
6.99 
5 . 
6o*s 
33-4 
1008.8 
685. s 
69.90 
57-46 
9.92 
10.04 
32. 2 
38*3 
516.8 
497*9 
42. XI 
49*27 
9. ii 
8.76 
Average. 
53-4 
34 * I 
» 3 S* 7 
521.4 
54 * 72 
43 * 6 i 
9 * 36 
7*64 
Transpiration...ratio.. 
A:B=i,s6 
A': B 
~i.6o 
Difference.. 
. a 04+ 
Water loss per gram of 
green weight.ratio.. 
AG : BG=*i.24 
A G': BG=i.28 
Difference. 
• 04-f 
Water loss per gram of 
dry weight,.ratio.. 
AD': BD-x.27 
A'D': BD=i. 3 i 
Difference. 
. .04+ 
It will be observed from Table III that the ratio values for the period 
after treatment are, in each case, slightly higher than the corresponding 
ratio values for the period before treatment. This indicates that the 
average rate of water loss by transpiration from the sprayed plants 
(series A') was slightly higher, relative to the average rates from the 
control plants, than was the corresponding ratio of water loss from those 
same plants (series A) for the period before treatment. It is to be noted, 
however, that while the ratios between average quantities for the period 
after spraying are all higher than the corresponding ratios for the period 
before treatment, the individual ratios for the period after treatment 
