1918] 
DUGGAR AND BONNS—RATE OF TRANSPIRATION 165 
the other lots as compared with the Bordeaux. It may per- 
haps be taken to suggest that the increased rate of transpira- 
tion of such films may in a measure be related to incipient 
injury, the rate being relatively high until this injury leads 
to wilting or death of a certain proportion of the leaves. 
Series E was arranged with relatively old, potted tomato 
plants which had been cut back and had grown considerably 
‘*bunched.’’ The greenhouse was maintained under the usual 
TABLE VI 
(Series F.—Potted marguerites) 
EFFECT OF BORDEAUX MIXTURE ON THE RATE OF TRANSPIRATION. 
TA IN GRAMS 
ШЕ зв | 4K | SR | вв [тк | вк 
4:50 P.M.-9:25 A.M. 1/24/17 | 33 | 36 | 22 | 35 | 18 | 38 | 19 | 35 
K:B:R = 54:93:89 = 1:1.72:1.65 
10:10 A.M.—4 Р.М. 1/24/17 | x A ee mes 57 | d 75 | 158 
K:B:R = 222:380:344 = 1:1.71:1.55 
| 1B’ | TU 3B' | ак) SR’ | 6B | 7K'| 8R' 
4:47 P.M.-9:08 A.M. 1/25/17 | 15 | 24 | 17 | 12 | 23 | 27 | 14 | 18 
K^B^R'- 26:59:65 = 1:2 
10:18 А.М.-3:03 Р.М. DAT. | б1 [75 | 54 | 60 | 72 | 72 | 86 | 67 
K^B^R'- 146187214 = 1:128:147 
*R = resin Bordeaux. 
conditions during intervals I-III and УШ-ХП. During in- 
tervals IV-VII the walls and floors of the house were 
drenched morning and evening, and a small stream of water 
kept flowing through the house in an effort to maintain higher 
humidities. This was fairly successful except in interval VI, 
when the bright sunshine and high temperature made it dif- 
ficult of accomplishment. During interval IV, moreover, the 
transpiration quantities are so small that the ratios are of 
questionable value. In this series three plants were treated 
with a reddened Bordeaux mixture, this being made by the 
addition of erythrosin to the usual Bordeaux until a deep red 
color was produced. The treated plants were sprayed 
copiously ; in fact, until the mixture streamed from the plants. 
