ACKNOWLEDGEMENTS v 



The Friend Mfg. Co., The Deming Co., F. E. Myers and 

 Bro., The Spraymotor Co., E. C. Brown and Co., The Goulds 

 Mfg. Co., and the Bean Spray Pump Co., all makers of spraying 

 appliances, furnished many of the illustrations of such apparatus, 

 while the Corona Chemical Co. and the Niagara Sprayer Co. 

 furnished some of the illustrations of dusters. 



The Orange Judd Publishing Co. furnished some of the Riley 

 figures. 



Many others helped by allowing their illustrations to be used. 



All illustrations have been properly credited in the text. 

 Credit for much of the direct and indirect assistance freely given 

 by many persons can not be extended to individuals but is none 

 the less appreciated. 



The publishers of this volume, John Wiley and Sons, Inc., 

 have done all in their power to cooperate with the authors and 

 make the task of preparing the manuscript as light as possible, 

 and to them and their organization we wish to extend our thanks. 



