[Vor. 1 
12 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
If Q' is greater than Q, then the spraying facilitates transpira- 
tion; if less, then the converse is true. If no accidents occurred 
: à; А- 
during the experiments, E would, of course, be a constant 
quantity, each term referring properly to the summed trans- 
piration quantities for three leaves during the standardization 
interval. Accidents are unavoidable, however, during the 
subsequent observations, and whenever these occur it is neces- 
sary to compute а new value of Q’ for any particular “run” 
in which the accident occurs. Тһе only consideration then is 
to have the same leaves (i. e., their summed transpiration 
quantities) in the ratios before and after standardization. If, 
for example, it is necessary to use a ratio, Q', of Nos. 1 and 3 
to Nos. 2, 4, and 6 after spraying, then the new value of Q 
(in the standardization interval) for comparison must also 
be computed with Nos. 1 and 3 against Nos. 2, 4, and 6. 
TABLE I 
EFFECT OF FILMS OF BORDEAUX MIXTURE ON TRANSPIRATION OF STANDARDIZED 
CASTOR BEAN LEAVES; DATA FOR DAY PERIODS 
No. of leaf 1 2 3 4 5 6 Ratio 
Transp. 12:30-2:30P.M., | A— B А- В В A— |А- 72.9 
1st day before spraying 10.8 | 17.3 | 28.5 | 45.9 | 33.8 | 33.6 В 97.0 
Transp. 3:12-5:00 P. М., A+ В” | А+ В! В” | А+ А+ 70.3 
1st day after spraying 7.6 | 20.4 | 23.2 | 26.2 | 26.1 | 39.5 dud - © 
72.9 
Relation, sprayed to un- Rate changed from 979 (= .75) to 
sprayed, Ist day 70.3 
72.7 (7.9) 
Transp. 812-948АМ, | A+ | в | A+ | B' | в | А+ |A+ 104 
2nd day after spraying 10.2 | 37.7 | 63.1 | 32.3 | 29.7 | 67.1 | В” 99.7 
Rate changed from E (2.75) to 
Relation, sprayed to un- 97.0 
sprayed, 2nd day, a. 140.4 
prayed, y 10-4 (2 aj) 
Transp. 11:16-11:53 A.M., | A+ | В | A+ | В | В | A+ |А-- 61.7 
2nd day after spraying 4.9 | 5.9 | 31.5 13.8, 7.5 | ре: H8 — 271.3 
72.9 Ж 
Relation, sprayed to un- Rate changed from 97.0 (2.75) to 
sprayed, 2nd day, b. 61.7 
375 (72.8) 
