110 HYDROCYAXIOACLD GAS FUMIGATION IN CALIFORNIA. 



Page. 



Fumigation of citrus trees, improved system, advantages 37-3S 



experience with it •_ 33-40 



injury to sprayed trees 72-73 



leakage of gas, allowance therefor under improved 



system 33-34 



McFadden machine for hoisting tents over trees 21-22 



supply wagon 23-24 



nature of residue resulting from generation of gas 50-51 



poles and derricks 20-21 



presence of old scales on fumigated trees 74 



procedure, general 24-31 



improved system 37 



old method 30-31 



published articles and addresses by R. S. Woglum. . 81 



renewal of interest in California 2-3 



securing measurements around and over tents 2S-30 



securing measurements around and over tents, Mor- 

 rill method 29-30 



sulphuric acid 41-43 



amount necessary 42-43 



proportion used with sodium cyanid . . 85 



. supply cart and supply wagon 22-24 



systems employed in California 4-6 



tents 10-20 



bell 16 



gas-proofing 16-18 



marking 19-20 



mildew-proofing 18-19 



sheet 10-16 



amount of cloth required for different- 

 sized tents 14-15 



construction 13-14 



experiments with new tent material 12 



material used 11 



new tenting material 11-12 



ring attachments and reenforcements 15-16 



sizes 11 



size to purchase 15 



what cloth to use 12-13 



time of year 61-63 



w$ter as a factor 44-47 



correct proportion with potassium cyanid 47 



sodium cyanid 85 



effect of different proportions on amount of 



available gas 45-47 



effect of different proportions on temperature 



of gas 45 



while fruit is small 65 



Fungus, black, following infestation of citrus fruits by mealy-bug 10 



sooty-mold, following infestation of oranges by black scale 3,9 



Gas. (See Hydrocyanic -acid gas.) 



Generating vessels, for fumigation 24 



cost 79 



cover device 74-76 



