774 The Wohurn Experimenis on “Potato Disease.'’ 
for the lime and sulphate of copper solutions and a 40- 
gallon paraffin cask for making the mixture in. The actual amount 
made each time was 33.J- gallons. Twenty gallons of water were 
stirred up in the large cask with 6| lb. of molasses ; 6| lb. of 
quicklime were put in one of the small wooden tubs with 6| gallons 
of water and allowed to cool down, after which the milk of lime 
was added little by little to the molasses and water, the whole 
being kept stirred. In a second wooden tub 6| lb. of pounded 
sulphate of copper were dissolved in a little boiling water, and, when 
dissolved, cold water was added, making the whole up to 6| gallons. 
The latter solution was then added little by little to the milk of 
lime and molasses mixture in the large cask, stirring being kept up 
vigorously all the time. This gave a bright blue liquor, made up as 
follows : — 
Molasses 
lb. 
(if . 
gallona 
. . with water 20 
lame 
Gf . , 
„ Gf 
Sulphate of copper 
Gf . 
■ • It » Oj 
20 
33f 
this being the required strength of the bouillie bordelaise sucrie 
(Mixture II.). 
In making up the ordinary bouillie bordelaise without sugar, 
6| lb. sulphate of copper were dissolved as before described, made up 
to 6§ gallons with cold water, and added little by little to 6| lb. of 
freshily-burnt lime slaked down with 26| gallons of water and 
allowed to cool. This gave the necessary strength of the Mix- 
ture I. 
In the steeping experiment with sulphate of copper, a solution of 
2 per cent, strength sulphate of copper was used, and the whole 
tubers were immersed in it for twenty-four hours, then taken out 
and left to dry. In the other steeping experiment, whole tubers 
were put for twenty-four hours in a bath composed of 6 lb. sulphate 
of ammonia, 6 lb. nitrate of potash, and 25 gallons of water, after 
which they were taken out and left for another twenty-four hours 
to swell, being then planted whole. This latter method is said to 
have resulted in producing in France a crop of 42 tons per acre ! 
The sulphate of copper was tested before using, and was found 
to be pure, but considerable difficulty was experienced in getting 
good lime locally, so that, ultimately, burnt lime had to be obtained 
from Buxton. The sulphate of copper was purchased from Messrs. 
Saunders, Fielding, & Co., 60 Lime Street, London, E.C. 
Application of the Dressing. — Mr. Elliott paid a good deal of 
attention to the best way of applying the dressings, the quantities 
required, and the permanence of the application, and he has furnished 
useful notes on the several points. His method of procedure was, — 
after having prepared the 33^ gallons of mixture in the 40-gallon 
cask, as mentioned in the last section, — to put the cask on a cart and 
convey it to the potato field. The contents were stirred up (other- 
