108 HYDROCYANIC-ACID GAS FUMIGATION IX CALIFORNIA. 



Page. 

 Cyanid of sodium, analyses of samples used for production of hydrocyanic -acid 



gas 92-93 



comparison with, potassium cyanid for general fumigation. . 90 

 dosages in fumigation compared with dosages of potassium 



cyanid 88-89 



first published suggestion as to use in fumigation 83-84 



inauguration of experiments by Bureau of Entomology and 



Bureau of Chemistry 84 



in fumigation of citrus trees, field tests 86-87 



kind to purchase for fumigation 88 



proportion for best yield of hydrocyanic-acid gas 93-96 



of chemicals when used for fumigation 85 



used in fumigation 85 



strength expressed in terms of potassium cyanid 85 



value for fumigation purposes 83-90 



Cyanids, action of mineral acids thereon 96-99 



effect of presence of sodium chlorid on yield of hydrocyanic-acid gas 



in fumigation 99-102 



nitrate on yield of hydrocyanic-acid gas. . 103 



Derricks for fumigating tents 20-21 



Distillate emulsion and Bordeaux mixture, injury through fumigation to trees 



sprayed therewith 72-73 



spray against citrus scales, efficiency as compared with fumigation 2 



Dosage calculation in fumigation of citrus trees 27-28 



factors affecting it in fumigation 52-53 



formula for measuring fumigating tents 28 



schedule A, for high grade sodium cyanid 88 



No. 1, for potassium cyanid 34 



|, for potassium cyanid 59 



f-A, for high grade sodium cyanid 88 



under improved system (with potassium cyanid) 34-37 



Dosages for scale pests in general (with potassium cyanid) 61 



' 'Firing' ' effect produced in orchards by purple scale 8 



Fumigation against black scale 59-60 



mealy-bug 63-64 



purple scale 53-57 



difficulty of destroying scale on fruit 56-57 



dosage for eradication (with potassium cyanid) . 55-56 



length of exposure 55 



two successive treatments 57 



red scale 57-58 



dosage with potassium cyanid 58 



yellow scale 60-61 



chemistry thereof 91-105 



summary 104-105 



generators, device for covering them 74-76 



of citrus trees. 1-81 



apparatus 10-24 



appearance of fumigated trees 73 



by associations 5 



contract 4-5 



counties 5 



private individuals 5-6 



