INDEX. Ill 



Page. 



' ' Gophers, ' ' injury to citrus trees 66 



Greenhouses, fumigation 2 



Gum disease of citrus trees 66 



Heat, effects in fumigation of citrus trees 69-70 



Hemerobius sp., enemy of mealy-bug (Pseudococcus citri) 63 



Bippodamia convergens, effect of fumigation thereon 77 



Hydrochloric acid, action on hydrocyanic acid 98-99 



Hydrocyanic acid, action of hydrochloric acid thereon 98-99 



mineral acids thereon 96-99 



sulphuric acid thereon 97-98 



gas (see also Fumigation). 



cautions regarding use 80 



chemicals used for production, analyses 91-93 



distribution within a fumigating tent 67 



fumigation, chemistry thereof 91-105 



summary 104-105 



leakage through tents, allowance therefor under im- 

 proved system of fumigation 33-34 



nature of residue from generation 50-51 



proportion of cyanid of potassium, sulphuric acid, and 



water for best yield of gas 93 



yield as affected by presence of sodium chlorid in cya- 



nids 99-102 



nitrate in cya- 

 nide 103 



Icerya purchasi, fumigation of citrus trees therefor 1 



Insect enemies of citrus fruits in California 7-10 



" Jingler " attachment for sheet tents, purpose 16 



Labor for fumigation, cost 79 



Ladybirds, effect of fumigation thereon 77 



Lemon trees, fumigation 65-66 



Lepidosaphes beckii. (See Scale, purple.) 



Light, effects in fumigation of citrus trees 71-72 



Linseed oil, use for gas-proofing fumigating tents 16, 17-18 



McDonnell, C. C, paper, "Chemistry of Fumigation with Hydrocyanic-Acid 



Gas" 91-105 



McFadden machine for placing fumigation tents on trees 21-22 



supply wagon for use in fumigation of citrus trees 23-24 



Mealy-bug, enemy of citrus fruits in California 10 



fumigation 63-64 



natural control. . .'. 63 



Meteorological elements (see also Climatic conditions). 



effects on fumigation of citrus trees 68-72 



Mills, fumigation 2 



Moisture, effects in fumigation of citrus trees 68-69 



Morrill method of measuring tented trees for dosage 29-30 



Nursery stock, fumigation 2 



Opuntia engelmanni, use of concoction for gas-proofing fumigating tents 16 



Oranges, decay in transit, causes 2-3 



Pepper tree. (See Schinus molle.) 



Poles for fumigating tents 20-21 



Potassium cyanid. (See Cyanid of potassium.) 

 Pseudococcus citri. (See Mealy-bug.) 

 Saissetia olex. (See Scale, black.) 



