162 MISSOURI STATE HORTICULTURAL SOCIETY. 



The copper is dissolved in i6 gallons of water, while the lime is 

 slaked in 6 gallons. When cool the solutions are mixed as described 

 above. This has proved equally as valuable as the original formula, 



2d. Eau Celeste, Audoynau J process: Dissolve i pound of sulphate 

 of copper in 2 gallons of hot water; when completely dissolved and the 

 water has cooled, add i^ pints of commercial ammonia (strength 22'* 

 Baume'); when ready to use dilute to 22 gallons. The concentrated 

 liquid should be kept in some wooden, earthen, or glass vessel. 



The effects obtained by this preparation have in most cases been 

 beneficial, yet when carelessly used, the foliage is occasionally injured 

 by it. To obviate this the following preparation is recommended: 



EAU CELESTE, MODIFIED FORMULA. 



Sulphate of copper 2 lbs. 



Carbonate of soda 2^ lbs. 



Ammonia (22^ Baume ' ) i^ pts. 



Water 22 gals. 



Dissolve the sulphate of copper in 2 gallons of hot water, in 

 another vessel dissolve the carbonate of soda in a similar manner ; mix 

 the two solutions, and when all chemical reaction has ceased, add the 

 ammonia; then dilute to 22 gallons. 



POWDERS. 



3d. Sulphatine, the Estevc process : Mix two pounds of anhydrous 

 sulphate of copper with 20 pounds of flowers of sulphur and 2 pounds of 

 air slacked lime. The proportions may be varied. 



4th. David's powder : Dissolve 4 pounds of sulphate of copper in 

 the least possible amount of hot water and slake 16 pounds of lime with 

 the smallest quantity of water required. When the copper solution and 

 slaked lime are completely cooled, mix them thoroughly together; let 

 the compound dry in the sun, crush and sift." 



The foregoing preparations adhere very firmly to all parts of the 

 vine with which they come in contact. The lime firmly fixes the copper 

 so that practically none of the latter substance is given up, excepting 

 when there is moisture present. Under the action of rain and dew the 

 copper is slowly dissolved, so that it is present on the leaves and fruit at 

 the very time the germs of the fungus are most active. Enough has 

 been said to show that early treatment is absolutely necessary in com- 

 bating the malady under consideration. Just as soon, therefore, as the 

 leaves are formed treatment must begin. For the first application, eau 



