REPORT OF THE CHEMIST 181 



SESSIONAL PAPER No. 16 



rNSECTICIDES AND FUNGICIDES. 



NEW FORMS OF KEROSEKE EMULSIONS. 



In an investigation carried on about a year and a half ago to ascertain the 

 emulsifying effect of certain materials — and more particularly lime, as advocated by 

 Professor Close — ia the preparation of Kerosene Emulsion, it occurred to the writer 

 that flour might answer for this ijurpose of holding coal oil in suspension. Experi- 

 ments proved this to be the case, a very satisfactory emulsion for immediate use 

 resulting. Eight ounces of flour were found sufficient to hold in perfect suspension 

 jone quart of coal oil. The emulsion is simply and easily made as follows: — 



The requisite amount of coal oil (Kerosene) is poured into the pail or barrel and 

 flour added in the proportion of 8 ounces to 1 quart of coal oil, the mass thoroughly 

 stirred and the water added — 2 gallons for every quart of coal oil. The whole is then 

 vigorously churned, say for 5 minutes, by means of pump and coarse nozzle or a 

 wooden paddle or dasher as used in upright churns — and the emulsion is ready for 

 use. The spray is smooth, easily atomized and does not clog the nozzle. 



During the last few weeks, this investigation, at the suggestion and with the 

 assistance of Mr. Macoun, has been extended to the preparation with flour of certain 

 sprays that might prove useful both as insecticides and fungicides, — Winter washes 

 to be employed on dorm.ant wood only and sprays that would combine the properties 

 of Bordeaux mixture and Kerosene Emulsion for summer use. The following notes 

 give briefly information regarding the emulsions which it has been thought might be 

 serviceable to the fruit grower. 



WINTER WASHES. 



Bluestone 1 per cent. Kerosene 10 per cent. 



Formula : 



Bluestone 4 lbs. 



Flour 8 " 



Kerosene 4 gals. 



Water 36 " 



Mix the flour with the kerosene, as before described. The bluestone being dis- 

 golved in the water, pour about one-half of the solution, (the exact quantity is a 

 matter of no moment) on to the Kerosene-Flour mixture aud churn for 5 minutes. 

 Pour in the remainder of the bluestone solution, stir, and the emulsion is ready for 

 use. 



On standing this spray separates into two layers, which, however, are readily re- 

 mixed by stirring. Free oil does not appear, if the churning has been efficient, for 

 at least 20 hours. 



Caustic Soda 2 per cent, Kerosene 10 per cent. 



Formula 



Caustic Soda 8 lbs. 



Flour 8 



Kerosene 4 gals. 



Water 36 " 



Caustic Soda S per cent, Kerosene 5 per cent. 



Formula 



Caustic Soda 8 lbs. 



Flour .. • 8 " 



Kerosene 2 gals. 



Water 38 



