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To prepare the Bordeaux, empty four gallons of bluestone solu- 

 tion into the spray tank or barrel, which already should have 25 or 

 30 gallons of water in it; stir the milk of lime thoroughly and empty 

 four gallons of it through the strainer into the spray barrel with constant 

 stirring ; then add water to make up to 40 gallons. 



Any one of several arsenical compounds may be used along with 

 the Bordeaux to form a combination insecticide and fungicide. The 

 following are among the best : 



(a) Paris Green. Add four to six ounces to 40 gallons of Bordeaux. 



(b) Ar senile of Soda. Boil together for 15 minutes one pound white 

 arsenic, four pounds sal soda, and two gallons water, until a clear solu- 

 tion is obtained. Add one to one and one-half quarts to 40 gallons of 

 Bordeaux. 



(c) Arsenite of Lime. Boil together for 45 minutes one pound arsenic, 

 two pounds fresh lime, and one gallon of water. Add one quart of 

 this solution to 40 gallons of Bordeaux. 



(d) Arsenate of Lead. Put four ounces of arsenate of soda in two 

 quarts of water in a wooden pail and eleven ounces acetate of lead in 

 two quarts of water in another pail. When dissolved mix together and 

 add to 40 gallons of Bordeaux. 



(3) Never mix the concentrated stock solutions together. If the 

 milk of lime and bluestone are mixed in the concentrated form, just 

 as they are taken from the stock solution, a precipitate of a flaky 

 nature will soon settle out, and either fall to the bottom or clog the 

 nozzle. 



(4) Test the Bordeaux to find out whether sufficient milk of lime 

 has been added. This is most easily done by means of the ferrocyanide 

 test. A saturated solution of this substance can be purchased at any 

 druggists for a few cents. In testing, place some of the Bordeaux, 

 which has been thoroughly stirred, into a saucer, and add a few drops 

 of the ferrocyanide. If sufficient lime has been used, no discoloration 

 will appear, but if insufficient, a deep dark brown color will be pro- 

 duced. 



(5) Always strain the milk of lime to prevent gritty particles from 

 clogging the nozzles. 



(6) Use a fine nozzle ; do not soak or drench the plants. 



(7) The stock solutions will keep, but the Bordeaux mixture becomes 

 useless after standing for two or three days. 



II. Resin=Bordeaux Mixture. 



Pulverized resin 5 pounds. 



Concentrated lye 1 pound. 



Fish oil 1 pint. 



Water 5 gallons. 



Place the oil, resin and one gallon hot water in an iron kettle 

 and heat till resin softens, add the lye and stir thoroughly; then add 



