INDEX. 



Page. 



Acids, mineral, action on cyanids and hydrocyanic acid 96-99 



Ammonia formed by decomposition of cyanid 102-103 



Ammonium sulphate, residue from decomposition of cyanid 102-103 



Bordeaux-distillate emulsion, injury through fumigation to trees sprayed there- 

 with 72-73 



Cactus. (See Opuntia engelmanni.) 



Carboy with handles to facilitate pouring acid in fumigation 25. 26 



Curt. (See Supply cart.) 



Chart for dosage (see also Dosage schedule). 



how to use it 34-37 



Chemicals in fumigation 40-51 



amount in very small dosages 48 



mixing 48—49 



most economical proportion 47-48 



proportion when sodium cyanid is used 85 



Chemistry of fumigation with hydrocyanic-acid gas 91-105 



summary 104-105 



Chrysomphalus aurantii. (See Scale, red.) 



citrinus. (See Scale, yellow.) 



Citrus fruits, insect enemies in California 7-10 



orchards in California, extent and character 6-7 



trees, fumigated, appearance 73 



presence of old scales thereon 74 



fumigation. (See Fumigation of citrus trees.) 



greater susceptibility of some varieties than others to injury from 



fumigation 67 



gum disease 66 



sprayed, injury to those fumigated 72-73 



unhealthy, effects of fumigation thereon 66-67 



Climatic conditions (see also Meteorological elements). 



effect on scale insects of citrus 76-77 



Coccinella calif ornie.a, effect of fumigation thereon 77 



Coccinellidse. (See Ladybirds.) 



Cold, effects in fumigation of citrus trees 70-71 



Cyanid, "American, " not potassium cyanid but sodium cyanid 84 



ammonia formed by its decomposition 102-103 



' ' German " 84 



of potassium, analyses of samples used for production of hydrocyanic- 

 acid gas 92-93 



comparison with sodium cyanid for general fumigation ... 90 



cost 79 



dosages of sodium cyanid in comparison with dosages of 



former 88-89 



in fumigation 40-41 



proportion for best yield of hydrocyanic-acid gas 93 



strength of sodium cyanid expressed in terms thereof. . . 85 



107 



