FORTIETH ANNUAL REPORT. 119 



make sure enough lime has been used. If Paris Green, arsenate of lead, 

 or any other f)oison is to be used, make it into a thin paste with a little 

 water and add it to the bordeaux mixture, which is now ready to be 

 used. 



INSECTICIDES. 

 POISONS, FOR INSECTS THAT CHEW. 



PARIS GREEN AND LIME. 



Always use lime with paris green, it makes the poison stick better, 

 beside greatly reducing the danger of burning the foliage. 



For spraying from a barrel, the writer has found the following method 

 very useful,— Place from one-quarter to one-half pound of good lump 

 lime, or unslaked lime, in each of three or four tin pails which will 

 hold about three quarts or less. Old cans or crocks will answer just 

 as well. Add enough hot water to slake it into a thin cream or paste. 

 Now add to each lot, one-quarter pound of Paris green, previously 

 weighed out, and placed in paper bags, stir while the lime is hot and 

 allow to stand for some time. Now measure out about forty-four gallons 

 of water in your spraying barrel, and make a mark that will show 

 how high it comes in the barrel, add the contents of one tin pail (viz., 

 one-quarter of a pound of paris-green and one-half pound of quick-lime 

 slaked) into the forty-four gallons of water in the barrel. Stir well and 

 spray. The pails or crocks can be used one at a time and refilled occas- 

 ionally so that the stock is always on hand ready for use. 



KEDZIE MIXTURE ( ARSENICAL). 



This mixture, originated by the late Dr. R. C. Kedzie, of this station, 

 is cheap, but it has the disadvantage of lacking a warning color. It 

 is a good substitute for Paris green, but must be made with care, and 

 stored in well labeled jugs. 



Dr. Kedzie in giving directions for its preparation says : ''Dissolve 

 the arsenic by boiling with carbonate of soda, and thus insure complete 

 solution ; Avhich solution can be kept ready to make a spraying solution 

 whenever needed. To make the material for eight hundred gallons (800) 

 of spraying mixture, boil two pounds of white arsenic with eight (8) 

 pounds of sal soda (crystals of carbonate of soda — 'washing soda'- — 

 found in every grocery and drug shop) in two gallons of water. Boil 

 these materials in any iron pot not used for other purposes. Boil for 

 fifteen minutes or until the arsenic dissolves, leaving only a small muddy 

 sediment. Put this solution into a two-gallon jug, cork tightl}', and 

 label 'Poison,' stock material for spraying mixture." 



"The spraying mixture can be prepared whenever required, and in 

 the quantity needed at the time by slaking two pounds of lime, adding 

 this to forty gallons of water ; pour into this a pint of the stock arsenic 

 solution. Mix by stiring thoroughly and the spraying mixture is ready 



