[Vor. 1 
354 АХМ:! OF THE MISSOURI BOTANICAL GARDEN 
plants in the experimental area might have equal exposure. 
Over the expernental plot а frame was provided, so that the 
whole area т... $ be protected by tarpaulins in case of rain. 
Fortunately, however, no rain occurred during the period of the 
experiment. 
After a preliminary exposure of 24 hours, which enabled us to 
determine that the 70 plants of the experimental area were in 
good condition, the initial weighings were made. А definite 
order was established, this being crosswise of the different lots. 
The same order was observed at the close of the period, and 
similarly in the second period a consistent scheme was followed, 
in order that the time interval might be as uniform as possible. 
After the weighings at the close of the first period, all plants 
were discarded which showed any signs of weakness or injury 
arising from the conditions of the experiment. It should be 
stated, too, that these conditions were taxing. Тһе weather 
was bright and warm, the pots were severely exposed, and, as 
already noted, the water content of the pots was necessarily 
fairly high. With the plants remaining in a condition appar- 
ently normal and vigorous from the first period, a second 
“тип” was made, the latter including from 4 to 7 plants in 
TABLE SHOWING WATER LOSS AND GREEN WEIGHT OF THE PLANTS 
Ist period, May 6-11, | 2nd period, May 11-15, 
10 plants | 7 plants 
Lot Film covering Ave. Ave. | Water | Ave. Ave. Water 
water | green loss per| water | green | loss рег 
loss рег| weight |g. green| loss рег | weight |g.,green 
plant |per plant| weight | plant |per plant| weight 
1 | Bordeaux, strong 526.6 | 50.3 | 10.46 | 463.3 | 55.0 8.42 
2 | Control 413.8 61.0 6.78 | 433.3 63.1 6.86 
3 | Bordeaux, weak 642.4 60.9 10.54 | 574.0 61.7 9.30 
4 | Lime wash 584.5 70.7 8.27 | 6013.6 76.3 8.04 
5 | Lime sulfur 443.0 | 62.8 7.06 | 450.7| 70.0 6.44 
6 | Bordeaux and lamp- | 
black 792.1 66.1 11.97 | 653.0 75.2 8.69 
7 | Lime and lampblack | 596.6 | 58.3 | 10.20 | 585.6 | 66.8 | 8.78 
each lot. In selecting plants for this second period, the size 
factor was again taken into consideration, as far as possible. 
