FORMULAS. 



Bordeaux Mixture. 



Copper sulfate (blue vitriol) 6 pounds. 



Stone or quick lime 4 " 



Water : 1 bbl. (45 to 50 gals.) 



Dissolve the copper sulfate in two gallons of hot water; or put it in a coarse 

 sack, as burlap, and hang this in four to ten gallons of cold water. Use only an 

 earthen or wooden vessel. Pour the copper solution into the spraying barrel and 

 fill the barrel half full of water. Slack the lime, dilute it to ten to fifteen gal- 

 lons, never less, and pour this milk of lime into the spraying barrel through a 

 wire strainer of about thirty to forty meshes per inch. Add water to fill the 

 barrel and stir the mixture vigorously. Bordeaux should be well stirred every 

 four to five minutes when spraying. Few agitators are satisfactory; a wooden 

 paddle worked by hand poAver is good. 



Bordeaux mixture itself should always be made fresh for each application, but 

 stock solutions of copper sulfate and lime may be kept to advantage when the 

 spraying operations are extensive. Copper sulfate may be dissolved in water at 

 the rate of one pound per gallon; and quick lime slacked at the rate of one pound 

 per gallon. For a barrel of Bordeaux, take six gallons of vitriol solution and four 

 gallons of milk of lime. It is better, however, to use the ferro-cyanide test when 

 the lime is taken from a stock solution. Both stock solutions should be kept 

 covered to prevent evaporation. 



Arsenite of Lime. 



White arsenic 1 pound. 



Stone lime , 2 pounds. 



Water 1 gallon. 



Boil together for forty-five minutes. This stock solution may be kept indefi- 

 nitely in a closed vessel. Some green dye stuff may be mixed with it to prevent 

 mistaking it for other material. One quart of the above per barrel will be suffi- 

 cient for most insects. 



The " Kedzie Mixture" is made by boiling together two pounds of white 

 arsenic and eight pounds of sal soda in two gallons of water, until the arsenic 

 dissolves. One pint of this stock solution and two pounds of slacked lime are 

 sufficient for forty gallons of the spraying mixture. 



Paris Green. 



For most purposes 1 pound is used in 150 gallons of water. In some cases 

 a more dilute mixture is made; and on potatoes some persons use a stronger one 

 (1 pound to 100 gallons). The poison distributes better in the water if it is 

 previously dampened and worked into a paste. To every 100 gallons of the 

 mixture add 1 or 3 pounds of lime. 



258 -.- - - 



