ANIMAL PESTS OF PLANTS 177 



ing cyanide. // is impossible to be too careful in this 

 respect. 



Remedies. 



Two very generally useful mixtures for spraying 

 plants with are : 



Kerosene or paraffin emulsion, made by dissolv- 

 ing half a pound of hard soap in one gallon of boiling 

 water. When dissolved, add two gallons of kerosene 

 (paraffin) to the hot liquid, and immediately churn up 

 well with a syringe until the mixture becomes creamy. 

 This is the stock solution, and, before using, water 

 should be added to make it up to thirty-three gallons. 

 Only rain-water or other soft water (that is without lime) 

 must be used. 



Whale-oil soap. Dissolve one pound of the soap in 

 one or two gallons of warm water, and use when cold. 



M 



