110 HYDROCYANIC -AC ID GAS FUMIGATION IX CALIFORNIA. 
Page. 
Fumigation of citrus trees, improved system, advantages. 37-38 
experience with it 38-40 
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 28-30 
securing measurements around and over tents. Mor- 
rill method 29-30 
sulphuric acid 41—13 
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 
water 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 
