72 FUMIGATION INVESTIGATIONS IN CALIFORNIA. 



Page. 



Scales, citrus, fumigation, during blossoming period 49-51 



gas, amount available as affected by different propor- 

 tions of water 37-38 



hydrocyanic acid, in drums 55 



leakage during operations 47-48 



in small trees 43^4 



temperature as affected by different proportions 



of water 35-36 



where large and small dosages are 



used. 36-37 



improved system 58-68 



advantages 63-64 



apparatus 53-61 



dosage schedule 64-67 



in use 67-68 



procedure 61-63 



supply cart 59-62 



method of computing dosage and volume for tented 



trees 25-26 



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 . . . 53-55 



supply cart 59-61 



table to replace supply cart on rough ground 61, 62 



tents, marking 27-30, 55-56 



sheet 17-18 



time of year 48-52 



tray for carrying chemicals in present system 18-19 



water as a factor 34-35 



correct proportion 38-39 



effect of different proportions on amount and 



temperature of available gas 35-38 



while fruit is small 51-52 



methods of control in California 16-17 



manner of feeding 14 



propagation 16 



Spider, citrus red, distribution in California 14 



enemy of citrus fruits. 11 



sulphur spray as remedy 16 



Spray, kerosene-water, against citrus scales 17 



Sprays, distillate, against citrus scales 17 



sulphur, against citrus scales 16 



Sulphuric acid for fumigation, amount necessary 32-34 



effect of too great an excess '. 34 



jar and cover 60-61 



