72 FUMIGATION ENVESTIGATIONS IN CALIFORNIA. 
Page. 
Scales, citrus, fumigation, during blossoming period 49-51 
- amount available as affected by different propor- 
tions of water 
hydrocyanic acid, in drums 55 
leakage during operations 47 4 s 
in small trees 43-44 
temperature as affected by different proportions 
of water 
when- large and Bmall dosages are 
used. 36-37 
improved system 
advantages 63 64 
apparatus 
dosage schedule 64 67 
in use 67 68 
procedure ; 61 63 
supply cart 59-62 
method of computing dosage aud volume for tented 
trees 25-20 
methods for obtaining measurements and dosage of 
trees with and without apparatus 26-30 
procedure in improved system 61 63 
present system 18-19 
proportion of materials used by fumigators 32—39 
simplification by improved system 68 
sulphuric acid, amount necessary 32-34 
effect of too great an excess 34 
jar and cover 60-61 
removal from drums and carboys. . . 5! 
supply cart 59-6 1 
table to replace supply cart on rough ground 1 . <;2 
tents, marking 27-30. " 
sheet 17-18 
time of year 4 s - 52 
tray for carrying chemicals in present system L8 
water as a factor 34-35 
correct proportion 
effect of different proportions on amount and 
temperature of available gas 
while fruit is small 51-52 
methods of control in California 10- 1 7 
manner of feeding 14 
propagation 16 
Spider, citrus red. distribution in California 14 
enemy of citrus fruits 11 
sulphur spray as remedy 16 
. kerosene-water, againsl citrus scales 17 
Sprays, distillate, against citrus scales 17 
sulphur, against citrus scales 16 
Sulphuric acid for fumigation, aim Mint necessary 32-34 
effeel of too greal an excess 34 
jar and cover «i (l 61 
