3. Copper mixture of Giroude, Bordeaux mixture. 



(La Vigne Americaine, Juno, 18;6, p. 193; Bull. 2,Bot. Div., U. S. Dept. of 

 Agr., 1886, p. 15; report of the Mycologist, U. S. Dept. of Agr., 1886, p. 

 100; Circular No. 3, U. S. Dept. of Agr., April, 1887 ; Circular No. 4, U. S. 

 Dept. of Agr., July, 1887 ; Le Milcliou, G. Patrigeon, 1887, p. 98 ; Traite- 

 ment-du Mildiou, Millardet, 1887, p. 35; Manuel Pratique pour le Traite- 

 nient des Maladies de la Vigne, Viala and Ferrouillat, 1888, p. 26.) 



Original formula. — Dissolve 16 pounds of sulphate of copper in 22 

 gallons of water, in another vessel slake 30 pounds of lime in G gallons 

 of water. When the latter mixture has cooled it is slowly poured into 

 the copper solution, care being taken to mix the fluids thoroughly by 

 constant stirring. It is well to have this compound prepared some 

 days before it is required for use. It should be well stirred before ap- 

 plying. 



^Numerous modifications in the preparation of this compound have 

 been suggested, chiefly for the purpose of reducing the amount of cop- 

 per. 



A solution containing the ingredients in the following proportions 

 has been recommended for general use: 



Sulphate of copper pounds . . 4 



Lime do 4 



Water gallons . . 22 



The copper is dissolved in 10 gallons of water, while the lime is slaked 

 in G gallons. When cool the solutions are mixed as described above. 



For treatment of mildew. For downy mildew and black-rot of the 

 grape. For blight and rot of the tomato and potato. 



4. Eau Celeste, Audoynaud process. 



(Progres Agricole et Viticole, March 28, 1886 ; Report of the Mycologist. 1886, 



p. 102; Circular No. 3, Sect, of Veg. Pathol. U. S. Dept. of Agr., April, 



1887 ; Circular No. 4, Sect, of Veg. Pathol. U. S. Dept. of Agr. , July, 1887 ; 



Sixth Report of the New York Experiment Station, 1887, p. 106 ; Le De"- 



veloppeiuent et le Traitementdu Mildiou etde L'Anthracnose, Millardet, 



1887.) 



Dissolve 1 pound of sulphate of copper in 2 gallons of hot water ; 



when completely dissolved and the water has cooled, add lh pints of 



commercial ammonia (strength 22° Bauvne) ; when ready to use dilute 



to 2£ gallons. The concentrated liquid should be kept in a keg or some 



wooden, earthen, or glass vessel. 



For downy mildew. For treatment of downy mildew and black rot 

 of the grape. For treatment of mildew and anthracnose. For blight 

 and rot of the tomato and potato. For apple scab. 



5. Eau ©eleste, modified formula. 



(Progres Agricole et Viticole, July, 1887, p. 18; Etc.) 



Sulphate of copper pounds . . 2 



Carbonate of soda do . . . 2£ 



Ammonia (22° Baume) pints . . LJ 



Water gallons . . 22 



