July 1,1925 Spreaders and Spreading Q ualities of Spray Materials 81 
The amount of lead arsenate that adheres to the leaf surface is 
approximately the same when a spreader is added as when one is 
not. 
LITERATURE CITED 
(1) Cooper, W. F., and Nuttall, W. H. 
1915. THE THEORY OF WETTING, AND THE DETERMINATION OF THE WETTING 
POWER OF DIPPING AND SPRAYING FLUIDS CONTAINING A SOAP 
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(2) Fahrenwald, A. W. 
1922. THE FILM METHOD OF MEASURING SURFACE AND INTERFACIAL TEN¬ 
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(3) Harkins, W. D., Brown, F. E., and Davies, E. C. Hr 
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( 4 ) - Davies, E. C. H., and Clark, G. L. 
1917. THE ORIENTATION OF MOLECULES IN THE SURFACES OF LIQUIDS, . 
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EMULSIFICATION, MOLECULAR ASSOCIATION, AND THE EFFECT OF 
acids and bases on interfacial tension. Jour. Amer. Chem. 
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(5) IsSLEIB. 
1914. DIE BESEITIGUNG DER INSEKTEN, WELCHE DEN WEIN-UND OBSTBAU 
SCHADIGEN, DURCH VERKLEBUNG MIT HILFE VON MOOSSCHLEIM. 
Ztschr. Pflanzenkrank. 24: 78-79.- 
(6) Langmuir, I. 
1917. THE CONSTITUTION AND FUNDAMENTAL PROPERTIES OF SOLIDS 
and liquids, ii. liquids. Jour. Amer. Chem. Soc. 39: 1848- 
1906, illus. 
(7) Moore, W. 
1921. SPREADING AND ADHERENCE OF ARSENICAL SPRAYS. Minn. Agr. 
Exp. Sta. Tech. Bui. 2, 50 p. 
(8) Quincke, G. 
1877. UEBER DEN RANDWINKEL UND DIE AUSBREITUNG VON FLUSSIG- 
keiten auf festen korpern. Ann. Phys. und Chem. (n. F.) 
2: 145-194. 
(9) Stearns, L. A. 
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