98 THE SUBURBANITE'S HANDBOOK 



Leave everything closed up tight for 40 minutes, then open from 

 the outside and air for at least ten minutes before entering. 



HYDROCYANIC ACID. 



(For Empty Houses.) 



Potassic Cyanide (98 or 99 degrees) one ounce per 100 cubic feet. 

 Sulphuric Acid (1.83, sp. gr. commercial), two fluid ounces per 

 100 cubic feet. 



Mix as directed for the last formula. 



NOTE I would recommend suburbanites unfamiliar with the 

 handling of these powerful poisons in fumigation not to use them 

 without the help of experts in the work. 



SOLUBLE OR MISCIBLE OILS. 



Recently the miscible oils have been put upon the market and 

 have now passed the experimental stage and have been found very 

 useful preparations for fighting fruit pests. Heretofore the formulae 

 on the market were proprietory and secret, and being too good a 

 thing to be gobbled up by monopolists. Mr. L. C. Penny has given 

 much attention to devising a practical method for the preparation of 

 miscible oils by means of special soap solutions. The soap solution 

 specially recommended by him contains: 



Manhadden (fish) Oil, 10 gallons. 



Carbolic Acid, eight gallons. 



Caustic Potash, 15 pounds. 



This mixture is heated to about 300 Fahrenheit,after which two 

 gallons each of kerosene and water are added. A number of in- 

 secticide formulae have been worked out by Mr. H. Penny, both for 

 winter and summer use. The one he considers most efficient for 

 winter use contains 3 2-3 gallons of the above soap solution, 40 gal- 

 lons paraffine oil, six gallons resin oil, and water sufficient for the 

 desired dilution. (See Bulletin 79 of Delaware Agricultural Station.) 



C. O. Haughton of Delaware Agricultural College has been ex- 

 perimenting in this direction, and he with other investigators has 

 found it necessary to use kerosene emulsion containing 15 per cent 

 to 20 per cent kerosene, in order to get satisfactory results in destroy- 

 ing scale insects. By means of miscible oils properly prepared scale 

 insects, were effectually destroyed when only 10 per cent of heavy 



