TABLE OF CONTENTS 



CHAPTER I 



PAGE 



ECONOMIC USE OF HYDROCYANIC ACID GAS . . 1-8 



Early history First use as an insecticide 

 Experiments in California Dry gas process 

 Inauguration of night fumigation First use 

 in Eastern orchards. 



CHAPTER II 

 How THE GAS is MADE 9-11 



Chemical ingredients Combination of chem- 

 icals Action of chemicals Vessel used for 

 generation Character of residue formed. 



CHAPTER III 

 PHYSIOLOGICAL EFFECTS ON PLANTS .... 12-24 



Experiments by Woods and Dorsett Practi- 

 cal tests upon orchard trees and nursery stock 

 Effects on seeds and low-growing plants. 



CHAPTER IV 



EFFECTS ON ANIMAL LIFE 25-26 



Fortunate accident Chickens pick up cyanide 

 shaken from a bag Cat destroyed in green- 

 house while asleep Experiences with various 

 animals. 



CHAPTER V 

 APPARATUS FOR USE IN ORCHARDS .... 27-34 



Early types for fumigators Construction of 

 sheet tents Oiling and painting tents Vege- 

 table decoction for treating tents. 



CHAPTER VI 



BELL AND HOOP TENTS 35~47 



General description Method of handling 

 The hoop tent popular in California Construc- 

 tion and manipulation. 



iii 



