HTDBOCYAXIC-ACID GAS TTTMIGATIO^ IX CALIFOBXIA. 



rod of sodium, analyses of samples used for prodnction of hydrocyanic-acid 



- 92-93 



comparison with potassium cyanid for general fumigation. . 90 

 dosages in fumigation compared with dosages of potassium 



cyanid 5 S-S =i 



first published suggestion as to use in fumigation 83-84 



inauguration of experiments by Bureau of Entomology and 



Bureau of Chemistry S4 



in fumigation of citrus trees, field teste 86-87 



i±id : y : 1. — : : : :r..u-; :i:r_ v> 



proportion for best yield of hydKK*yanic-acid ga« 93-96 



: /.:_:-- \-r~ ::::_:_;-: ii v; 



used in fumigation Kj 



strength expressed in terms of potassium cyanid n: 



value for fumigation purposes :- 



_ids. action of mineral acids thereon 96-99 



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



in fumigation -. 2 



nitrate on yield of hydrocyanic-acid gas. . 103 



I'-r:;: .'.•:- : : :7.r_ir; :: . 't:."- L'-Ll 



Distillate emulsion and Bordeaux mi x ture, injury through fumigation to trees 



sprayed therewith 72-73 



spray against citrus scales, efficiency as compared with fumigation 2 



Dosage calculation in fumigation of citri - _ 7—2 9 



factors affecting it in fumigatiori 52-53 



formula for measuring fumigating tents _ ^ 



schedule A, for high grade sodium cyanid 55 



. 1. for potassium cyanid :>4 



f , for potassium cyanid 59 



f- A. for high grade sodium cyanid 55 



under improved system - with potassium cyanid :>i-37 



Dosages for scale pests in general (with potassium cyanid 1 



Firing'" effect produced in orchards by purple scale 



Fumigation against black scale 59-60 



mealy-bug »>3-64 : 



r - . - . -r ': :-: ~ 



difficulty of destroying scale on fruit : - " 



dosage for eradication (with potassium cyanid . 55-56 



. : -E-7-:" : fir- 55 



two successive treatmen: - 



red scale :■"-:■ 5 



dosage with potassium cyanid " ; 



How scale 60-61 



chemistry thereof 91-105 



summary 14-1" 



generators, device for covering them M— 7 



of citrus tree* 1-51 



apparatus 10-24 



appearance of fumigated bees 



by associations 5 



contract --. 



counties 5 



private individuals 5-6 



