1918] 
DUGGAR AND BONNS—RATE OF TRANSPIRATION 163 
discussion of ratios mention has not been made of the L lot 
of plants, but owing to the successive falling off in their rate 
of water loss during the standardization interval, it was felt 
that this lot could not be considered entirely normal. Never- 
TABLE IV 
(Series D.—Potted tomatoes) 
EFFECT OF BORDEAUX ye ge ON THE RATE OF TRANSPIRATION. 
MS 
IN GRA 
E 2Fe*| 3B | 4Fe ди (еме ТА эме 
8:31 А.М.-3:42 Р.М. 1/19/17 E | 29 | 20 | 18 | 36 | 26 | 27 | 28 
B:Fe:Al:Mg = 41:47:63:54 = 1:1.15:1.54:1.32 Sunshine сам: 
н 3:42 P.M.-9:35 A.M. 1/20/17 | 11 | 12 | 117 | 12 | 13 Е | 13 
B:Fe:Al:Mg = 22:19:23:26 = 1:.86:1.05:1.18 Sunshine | | | 
E 9:5 A.M.-11:17 A.M. 1/20/17 | 6 |9 |6|8 | 1 | 7 | 7 | 10 
B:Fe:Al:Mg = 12:17:18:17 = 1:1.42:1.5:1.42 Sunshine — — as 
1B’ |2Fe'| 3B’ |4Fe' sar | Mg ТАР 8Mg 
MERE P.M. 1/20/17 | 16 | 17 | 16 | 15 | 25 | 35 | 22 | 34 
B’:Fe’:Al’:Mg’ = 32:32:47:69 = 1:1:1.47:2.16 Cloud 
10:12 P.M.-12:45 P.M. 1/21/17 | 25 | 33 | 22 [2 E | 38 | 33 E 
B’:Fe’:Al’:Mg’ = 47:54:61:76 = 1:1.15:1.3:1.62 Intermittent sunshine | 
" 10:48 P.M.-9:24 A.M. 1/22/17 | 16 | 19 | 11 | 12 | 15 | 17 | 17 | 20 
B’:Fe’:Al’:Mg’ = 27:31:32:37 = 1:1.15:1.19:1.37 ( АЕ: 
m 9:24 A.M.-3:15 P.M. 1/22/17 |23 | 21 | 21 | 17 | 12 | 15 | 18 | 22 
I | | | | | 
B’:Fe’:Al’:Mg’ = 44:38:30:37 = 1:.86:.68:.84 
* Fe = film of $ed hydrate. {АІ = film of aluminum hydrate. { Mg = film 
of magnesium hydrate 
theless, it exhibits on the whole much the same change of ratio 
with change of conditions as the B’ and BC’ lots. Here again, 
as in our earlier experiments, the effect of the lime film has 
not generally been to increase the transpiration loss to the 
same extent as the copper films. 
The data for series D are introduced with some hesitation, 
owing to the fact that at the close of the experiment all of 
the plants except one of those sprayed with Bordeaux mix- 
ture showed some injury, the extent of this being the wilting 
or death of from 1 to 4 leaves of each plant. Nevertheless, 
