Dec. x8,19x6 Influence of Bordeaux Mixture on Transpiration 
545 
Table VII .—Effect of Bordeaux mixture on the rate of transpiration of potted tomato 
plants 
{Period before treatment, May 26 to June x; period after treatment, June x to June 12,19x6] 
Plant No. 
Transpiration quantities. 
Green weight 
of tops. 
Dry weight 
of tops. 
Period before 
treatment. 
Period after 
treatment. 
Series 
A. 
Series 
B. 
Series 
A'. 
Series 
B. 
Series 
A'. 
Series 
B. 
Series 
A'. 
Series 
B'. 
(A) 
<B) 
i'A) 
(B) 
(G) 
(G') 
(D) 
(/>') 
831.2 
210.6 
245.0 
231-9 
17 * 7 o 
16.76 
2.40 
2 * X 3 
260.8 
182.2 
269.9 
268.9 
17-50 
14.65 
2.20 
1*77 
3 .. 
143*0 
170.6 
*38.3 
203.2 
19.15 
14.72 
2. OX 
1.87 
171*7 
17*5 
226.5 
207.0 
X$‘ 12 
* 5 -os 
2.02 
2.00 
215.8 
171*0 
291.2 
142*4 
21.03 
15.52 
2.68 
1.98 
184.5 
2x2.0 
202. s 
214.1 
13*95 
X4*oi 
x.92 
1.92 
Average. 
201. i 
X86.4 
* 45*5 
2ix. 2 
17.40 
15. XI 
2.20 
1*94 
Transpiration.ratio.. 
AB«i 
.07 
A'B= 
*1.16 
Differea 
ice. 
Water loss per gram of green 
substance.ratio., 
AG' BG—0.03 
A'G' BG-x.oi 
Difference. 
Water loss per gram of dry 
substance.ratio.. 
AD' BD=*o.95 
A'D' BD=*x.o2 
Difference. 
From Table VII it will be, observed that the ratios between transpira¬ 
tion qualities and between quantities representing water loss per gram 
of green substance for the periods after spraying are 8 per cent and 9 per 
cent higher, respectively, than the corresponding ratio values for the 
periods before spraying, while the ratio between quantities representing 
water loss per gram of dry substance is 7 per cent higher for the period 
after treatment. The average transpiration rate for the sprayed plants, 
relative to the control plants, is therefore 8 per cent higher than the 
average relative rate for the same plants before treating them with 
Bordeaux mixture. 
Table VIII presents a brief summary of the average data contained in 
Tables III, IV, V, VI, and VII. The values of the ratios between aver¬ 
age transpiration quantities, between average water loss per gram of 
green substance and between average water loss per gram of dry sub¬ 
stance, for the periods after spraying, are here given in terms of the cor¬ 
responding ratio values for the standardization periods considered as 
unity. The ratio values for the standardization periods are therefore 
omitted from the table, since all have the same relative value (1.00). 
A comparison of the ratio values presented in this brief summary 
shows that the treated plants of each species here dealt with giave higher 
average rates of transpiration, relative to the rates from their respective 
controls, than did the same plants during the standardization periods. 
The lowest average rates of water loss for periods after treatment occurred 
with cabbage plants, showing an average increased rate of 2 per cent 
over the corresponding rate for the standardization period. It has 
already been pointed out that the low increased rates of water loss 
