Experiments with insecticide sprays 105 



Kerosene emulsion 105 



Tobacco preparations 106 



Insecticide sprays in wheat fields 107 



Experiments with solutions of soap 108 



Field experiments and demonstration fields 110 



Demonstrations with coal-tar in 1910 110 



Demonstrations with road oil No. 6 in 1911 112 



Eoad-oil No. 7 in 1912 113 



The final campaign ( 1914) 115 



The legislative remedy 117 



Summary 120 



Figures 123-127 



L 



