232 THE TREE DOCTOR 



To make sodium sulfid for treating seed potatoes, use at the 

 rate of 1 Ib. caustic soda to 10 oz. sulfur for 36 gallons of so- 

 lution. 



9 Calcium Sulfid (Lime Sulfid). 



Quicklime, 1 to 2 pounds. 



(Or dry air slaked lime or hydrate of lime, one-fourth more.) 

 Flowers of sulfur, the same amount. 

 Water, 50 gallons. 



Proceed as directed for first steps in making lime, sulfur 

 and salt mixture. Heat till the color has become red, showing 

 the formation of the lime sulfids. This will require an hour or 

 more. Dilution while warm is to be preferred, but the solution 

 should cool somewhat before applying on foliage. 



Caution While this may be used on the peach in foliage, 

 and upon other fruits, care should always be exercised in the 

 preparation to avoid injury to the foliage from the application. 



10 Formalin. 



For oats and wheat, 1 Ib. formalin to 50 gallons of water. 



For potato scab and rosette, y 2 pint of formalin to 15 gal- 

 lons water. 



For onion smut, 1 Ib. of formalin to 25 or 33^ gallons of 

 water. 



INSECTICIDES. 

 11 Kerosene Emulsion. 



Dissolve one-half pound hard soap in one gallon of water 

 (preferably soft water) and while still boiling hot, remove from 

 the fire and add two gallons of kerosene. Stir the mixture vio- 

 lently by driving it through a force pump back into the vessel 

 until it becomes a creamy mass that will not separate. This re- 

 quires usually from five to ten minutes. The emulsion is then 

 ready to be diluted with water and applied. For the common 

 scale insects and hard bodied insects, like the chinch bug, use one 

 part emulsion to eight to ten parts of water. For soft bodied 



