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 
Eippodamia 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- 
nids 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 -Ac id 
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 olese. (See Scale, black.) 
