« 210 REportT OF THE BOTANICAL DEPARTMENT OF THE 
On Series III the following mixture was used: 6 pounds copper 
sulphate, 414 pounds quicklime, 8 pints of the arsenite-of-soda 
stock solution and 50 gallons of water.** The copper sulphate, 
lime and water were first’ made into bordeaux mixture, the 
arsenite of soda then added and spraying begun at once. 
On Series IV bordeaux alone was used. 
In all cases the spray mixtures were applied at the rate of 100 
gallons per -acre. 
On July 12, 1.92 inches of rain fell. The following day it was 
observed that the rows of Series II, sprayed with arsenite of soda 
in lime water, were showing spray injury. The extent of the 
injury was not great enough to materially affect the crop, but 
there was positive injury. Leaves here and there were showing 
dead brown areas of various shapes and sizes. Some of the 
spots were on the margins of the leaves and others on the 
interior. Certain weeds, also, were injured; namely, rough pig- 
weed (Amaranthus retrofierus), yellow foxtail (lxophorus 
glaucus) and Polygonum sp. Lamb’s quarters (Chenopodium 
album) was wholly uninjured. 
On the rows of Series III, where the arsenite of soda had been 
applied with bordeaux there was no evidence of spray injury. 
The check rows, also, were perfect in foliage except for traces of 
sunscald as in the paris green experiment (See page 203). 
SECOND SPRAYING. 
This spraying was made July 238 and 25.7% ‘Series II was 
sprayed with 3 pints of arsenite of soda and 6 pounds of lime in 
50 gallons of water. Series III received bordeaux mixture (6— 
6-50 formula) with 3 pints of arsenite of soda to 50 gallons 
added just before spraying was begun. Series IV received only 
bordeaux of the 6—6—50 formula. | 
In this spraying all spray mixtures were applied at the rate of 
150 gallons per acre. 
At 4 p. M.** July 26 the rows of Series II, sprayed the day 
before, were found to be considerably injured as in the previous 
* This formula was used by mistake. It was intended to use 6 lbs. copper 
sulphate, 8 lbs. lime and 4 pints arsenite of soda in order to make this 
series strictly comparable with Series I. 
*'The rows of Series IV and Rows 3, 7 and 11 of Series III, were sprayed 
on the afternoon of July 23. It then commented to rain and there was no ~ 
opportunity to finish the spraying until July 25. 
*°'There was a shower at 2 P. M. 

