AN ENTOMOLOGICAL CALENDAR. 53 



required amount of each of the stock solutions to 25 g'allons. 

 and then pour the two chkited sijhitions together, 

 h^or dormant trees use: 

 C'u S04, 6 pounds ; 

 Lime, 6 pounds ; 

 Water, 50 gallons. 

 i'^)r plants in foliage use: 

 Cu S04, 4 pounds ; 

 Tdme, 6 pounds; 

 Water, 50 gallons. 

 For tender foliage, such as plum, etc., use: 

 Cu S04. 3 pounds ; 

 Lime, 6 pounds ; 

 Water. 50 gallons. 



TESTS FOR BORDEAUX. 



One must be sure that the solution is alkaline. 



There are three simple tests which may be used to deter- 

 mine this. "First, hold a clean, bright knife blade in the Bor- 

 deaux Mixture for at least one minute. If it becomes copper- 

 plated more lime should be used. Second, pour some of the 

 Bordeaux Mixture into a shallow dish. and. holding it up to 

 the light, blow gently across its surface. If properly made a 

 thin pellicle will form on the surface of th.e liquid. If this< 

 does not form more lime should be added. Third, dissolve 

 one ounce of ferro-cyanide of potassium in fi\e or si.x ounces 

 of water. Pour some of the Bordeaux Mixture into a wdiite 

 dish and add to it a few drops of the ferro-cyanide solution. 

 If sufficient lime has been used no change will be noticed. If 

 a brownish-red discoloration takes place more liiue should be 

 added." 



RECIPE FOR LIME-SULPHUR WASH. 



To 2 gallons boiling water add 2 lbs. quick lime. After 

 lime has slaked add 13^ pounds of powdered sulphur (first 

 stirring it up with a little water to form a paste). Boil one 

 half hour or more and strain thru a netting or sieve, and add 

 enough water to make 5 gallons. Or, the following' propor- 

 tions may be used, — 20 lbs. lime, 15 lbs. sulphur, 50 gals, of 

 water. 



