INSECTICIDES AND FUNGICIDES 87 



SULPHIDE OF LIME 



May be easily made with a peck of lime and ten pounds of sul- 

 phur. Place the lime in a half barrel, sprinkle with water, 

 then with sulphur, until all is slaked. Do not use too much 

 w^ater at first or it will drown the lime, nor too little or it will 

 burn it. Stir well, cover and let boil for two hours. Then 

 fill with water, cover and let stand over night. In the morning 

 a thin scum will be formed; take this off and throw it away. 

 You will then have several gallons of clear, amber colored li- 

 quid. Bottle this up and use as required; for mildew on foliage 

 using one part sulphide to thirty parts of water. After taking 

 off the first lot of liquid you can fill up the barrel with water, 

 stir well and proceed as before, when a second lot may be ob- 

 tained. After this the refuse is good for whitewashing the bot- 

 toms of benches. 



SULPHATE OF COPPER OR BLUE VITRIOL 



Is found among veins of copper. It is manufactured on a large 

 scale by being gently roasted. During this process dioxygen is 

 absorbed from the air, the product is then dissolved in water 

 and the remaining salts crystallized. It is used in Paris green, 

 Bordeaux and other mixtures. 



CARBONATE OF COPPER 



Also used in spraying solutions, is the result of slow and various 

 processes of refining, and is useful in fungous diseases. 



CYANIDE OF POTASSIUM 



Is used in forming the deadly hydrocyanic acid gas. This is not 

 used by Rose growers as a general thing. The gas will kill 

 any insect, scale, or animal life. Some writers claim that the 

 cyanide (which looks innocent enough) will cause death 

 through an unprotected wound in the hand or by simply inhal- 



