Arsenite of Lime — Kerosene 209 



deaux mixture. It is generally a more variable commodity than 

 the Paris green and is not used so much as formerly. 



Arsenite of lime. — White arsenic, 2 lbs. ; carbonate of soda 

 (sal soda, washing soda), 8 lbs.; water, 2 gals. 



Put all the materials into an iron kettle, which should not 

 be used for any other purpose, and boil for fifteen minutes, or 

 until the arsenic dissolves. Add water to replace that escaped 

 by evaporation, making two gallons of the stock solution. This 

 may be prepared at any time, and will keep indefinitely if put 

 in a tightly corked bottle. Be sure to put the bottle in a safe 

 place and label it Poison." 



To make fifty gallons of the spraying mixture but one pint 

 of this stock solution is needed ; hence the formula given is suffi- 

 cient for sixteen barrels (of 50 gals. each). Two to four pounds of 

 stone lime are slaked and added to each barrel. If the arsenite 

 of lime is used in Bordeaux, like Paris green, it will not be neces- 

 sary to use lime in addition to that already in the Bordeaux. 



Kerosene and soap emulsioyi. — For insects which suck their 

 food, as scales, plant-lice, and the true bugs (like the squash- 

 bug), the kerosene compounds are the most popular insecticides. 

 Kerosene and soap emulsion is the standard. There are several 

 ways of making this, but the following is one of the best: Into 

 boiling soft water (one gallon), place one-half pound of hard soap; 

 when the soap is dissolved, add two gallons of kerosene (or eoal- 

 oil). In order to thoroughly emulsify the ingredients, run them 

 through a pump vigorously for fifteen or twenty minutes, at the 

 end of which time the material should be so thoroughly emulsified 

 that the liquid has a milk-like constituency. This material may 

 then be diluted with water ten to fifteen times when using. If 

 the emulsion is to be used on dormant trees in the winter it is 

 not necessary to dilute it so much. The kerosene emulsion is 

 sure death to all plant-lice and to scale insects when they are in 

 their young or feeding stage. When treating plant-lice, how- 

 ever, it is very essential that the application be made before the 

 leaves have curled up and afforded them protection. 



Kerosene and water emulsion. — A mechanical emulsion of 

 kerosene and water is a very efficient insecticide, and has been 



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