228 Bulletin 253. 



Formulas. 



Bordeaux Mixture. 



Copper sulfate (blue vitriol) 5 lbs. 



Stone lime 5 



Water to make 50 gals. 



Many methods are recommended for making the mixture. The 

 following is handy and practical for the grape-grower: 



Dissolve the copper sulfate crystals in water. Then pour the solu- 

 tion into the tank. Fill the tank about three-fourths full of water. Slake 

 the lime in a pail or tub, applying hot water at first. Bring the lime to a 

 thin milk. Strain this mixture into the spraying tank, and add water to 

 make the mixture up to the required amount. 



Ammoniacal Copper Carbonate. 



Copper carbonate 5 oz. 



Ammonium 3 pts. 



Water to make 50 gals. 



Dilute the ammonium with six or eight times its volume of water. 

 Add the copper carbonate to the diluted solution, and stir until dissolved. 

 Add water to make the required amount. 



If large quantities of the above mixture are required, it is more 

 economical for the grower himself to make the copper carbonate. Pro- 

 ceed as follows: Dissolve 12 pounds of copper sulfate (blue vitriol) in 

 12 gallons of water in a barrel. Dissolve 15 pounds of sal soda in 15 gal- 

 lons of water (preferably hot). Allow the solution to cool; then add the 

 sal soda solution to the copper sulfate solution, pouring slowly in order 

 to prevent the mixture from working up and running over. A fine pre- 

 cipitate which will settle at the bottom after the mixture has stood about 

 twelve hours is formed. Siphon off the clear liquid above. Wash the 

 precipitate by adding clear water, stirring and again allowing to settle. 

 Siphon off the clear water, strain the precipitate through muslin, and 

 allow it to dry. This is copper carbonate. The above amounts will 

 make about six pounds. 



