No. 6. DEPARTMENT OF AGRICULTURE. 191 



pounds mechanically suspended in water. The sulphate of lime is 

 so heavy, it quickly settles and carries the hydrate of copper with 

 it to the bottom, therefore, it must be kept agitated. Now when 

 this is properly made it will remain suspended three times as long 

 as ordinarily made. 



To make Bordeaux mixture requires 3 barrels. In one put 25 

 gallons water, place 6 pounds sulphate of copper in a sack and sus- 

 pend it in this, then slack 4 pounds fresh burnt lime in another 

 barrel and add enough water to make 25 gallons, then place a sieve 

 over the third barrel and pour the copper solution and lime through 

 it simultaneously. This makes a Bordeaux mixture that will give 

 best results. This is a fungicide only, but by adding Paris green or 

 arsenite of lead or arsenite of soda it acts as a fungicide and insec- 

 ticide. 



Arsenite of Soda. This is the cheapest insecticide and can be 

 made by the farmer himself. Take 2 pounds white arsenic, 6 pounds 

 sal-soda, boil in 1 gallon of water until dissolved, put in a gallon jug, 

 add enough water to make 2 gallons. One pint of this is equal to 

 4 ounces of Paris green, and much more reliable as it will remain 

 suspended longer being finer than the Paris green. 



Lime, Sulphur, Salt. This is a specific for San Jose" Scale when 

 rightly made and applied. My formula is: 60 pounds lime, 50 pounds 

 sulphur, 25 pounds salt. In a large kettle, put at least 30 gallons 

 water, and while this is coming to a boil, weigh out your ingredients, 

 place the sulphur in a tight barrel, add sufficient boiling water to 

 make it by stirring into a thin slop, then put the lime into the boiling 

 water (about 20 gallons) in the kettle when it commences slaking, 

 immediately creating an intense heat, pour in the sulphate at once 

 and with a stout paddle keep the lime from burning fast to the 

 kettle. This soon settles down to a steady boil, continue stirrinjr 

 and boiling until you have the chemical change complete. This may 

 take from 30 minutes to one hour. When it has gone through the 

 various changes of color, from yellow to orange, then to dark 

 brick color, it is complete, remove and pour through a 

 sieve into the mixing tub and dilute to make 150 gallons. 

 It then has a greenish yellow color. This should be applied 

 while warm as it works better. Never leave it stand over 

 night or it throws down sliver like crystals, hydrosulphide of lime 

 Ca (S H)% and then the wash has but little value unless the crystals 

 are redissolved by boiling. The value of lime-sulphur-salt is due 

 to two main factors, its causticity, which acts upon the scale as a 

 contact remedy, and its mechanical property acting as a deferent, 

 preventing the young from attaching themselves. 



Lime, Sulphur and Caustic Soda Wash. Lime 100 pounds, sulphur 

 50 pounds, caustic soda 12£ pounds, water 150 gallons. The lime 



