180: REPORT OF THE BOTANICAL DEPARTMENT OF THE 
(2) Solution of sucrate of lime furnished by the Wisconsin Experi- 
ment Station. 
One quart of (1) was mixed with one quart of (2) and three 
quarts of water. After standing 15 or 20 minutes this mixture 
(containing five quarts) was added to 95 quarts of water, making 
a total of 100 quarts, and spraying commenced at once. 
Soda bordeaux.—Two pounds of copper sulphate was dissolved 
in two quarts of water by boiling, then diluted to 32 quarts. 
Two and one-half pounds washing soda was dissolved in two 
quarts of water by boiling. After being cooled this was poured 
into 32 quarts of copper sulphate solution and enough water 
added to make 64 quarts in all. The litmus test indicated that 
the mixture was very nearly neutral. 
Lime bordeaux.—Two pounds of copper sulphate dissolved in 
32 quarts of water. To this was added a quantity of milk of 
lime equal to about one and one-half times that required to 
satisfy the potassium ferrocyanide test. Finally, enough water 
was added to make 64 quarts in all. This is the regular 1-to-8 
formula which we recommend for spraying potatoes. 
NOTES. 
The first application was made in the forenoon of August 2. 
In the afternoon there was rain and it is likely that the last five 
rows in Series II (soluble bordeaux) did not get thoroughly dry 
before the rain came. 
Between the first and second sprayings considerable rain fell. 
Nevertheless, on Series III and IV the mixture applied in the 
first spraying was quite conspicuous at the time of making the 
second one. Whether the soluble bordeaux was washed off by 
rain was impossible to determine because it does not discolor the 
foliage at all. It was impossible to tell which rows had been 
sprayed and which not. For use on potatoes this feature of the 
soluble bordeaux is a decided disadvantage. The same thing 
was observed at the time of the third and fourth sprayings. 
Series III and IV showed abundant evidence of the mixture 
ayplied in the previous spraying, but on Series II there was no 
discoloration of the foliage, not even immediately after spraying. 
At no time was there any evidence of spray injury on any of 
the series. 
