CONTENTS 



PAGE 



Introduction 103 



Experiments in Jolly orchard, Olney, III., spring of 1922 104 



Experiments in University orchard. Olney, 111., winter of 1922-23 105 



The theory of emulsion lOS 



The use of a solid as an emulsifier 106 



The use of soap as an emul.sifier 106 



Increa.se in volume of boiled emulsions 108 



De-emulsiflcation 109 



Combination of oil emulsion witli other materials Ill 



Comparison of boiled emulsions with lime sulfur and various 



miscible oils 112 



Experiments in Hartline orchards, Anna, 111., winter of 1923-24. . . , 113 



A comparison of oils for oil emulsion 119 



A comparison of boiled fish-oil-soap emulsions and cold-mixed emulsions.. 119 



Vegetable-oil-soap emulsions IZl 



Summer sprays with oil emulsion, 1923 and 1924 121 



Experiments in Ed Kelley orchard, Anna, 111., winter of 1924-25 123 



The effect of cold winters on San Jose scale and scale sprays 125 



Summary and recommendations 125 



I 



