Circular 21 - Insecticides and Subsidiary Materials 3 
Table of Contents (Continued) 
Page 
Petrolatum 6l 
Petroleum (Crude Oil ) , 62 
Phosphorus Paste 63 
Pine Oil 6l, 
Pine Tar Oil 64 
Pyrethrum 65 
Sassafras Oil 68 
Silver Nitrate 68 
Sodium Arsenite 69 
Sodium Benzoate 76 
Sodium Bicarbonate 71 
Sodium Fluoride 71 
Si^eariuint Oil .- 72 
Sta-V/ay 73 
Sulfonated Castor Oil 73 
Sulfur 74 
Sulfuric Acid 75 
Talc or Talcum 76 
Tartar Smetic 77 
Tartaric Acid 78 
Thallium Sulfate 78 
Turpentine 79 
Vine^^ar SO 
Washin;.-: Soda 81 
Procurement of Insecticides and Subsidiary 
..laterials 82 
References So 
FORr.;ORD 
Chemicals ii: various forms when employed 
to kill or repel insects, mites, and rel:\ted 
pests are knov.n as insecticides. ?cr convenience 
insecticides are classified as stomac:: p^-^^^is, 
contact poisons, and f u:ai^^:ants. Stomach poisons 
are used to combat many insects that feed by 
chewin.:: and r:na\vin;':. The insecticides are applied 
to the material used as food by the insects and 
