6o 
Circular 23 - Reference Index 
Vaporizers (electric) 
(Cont'd) 
description; uses 
20-9,10. 
manufacturers and 
distributors 20-11. 
Vaseline 
trade name for 
petrolatum. . .21-61. 
Vaults (for fumigation) 
construction. . 22-43 . 
methods of fumigation 
22-44. 
plan.. (illus.) 22-45. 
Vegetable gums 
emulsifiers. . . ,21 -5. 
Velvet ants (Multillidae 
description; habits; 
Peruvian species 
15-12. 
Venomous caterpillars 
control 15-16. 
irritating effects 
15-15. 
kinds 15-15. 
treatment of irrita- 
tions 15-18. 
Ventilation (buildings 
or rooms) 
termite prevention 
or control 
2-S, 19, 24, 30; 
2A-4;(illus. )2-20. 
when treating with 
chemicals 6-10. 
Vermorel spray nozzles 
description; uses 
20-27. 
Vespa (see Paper wasps) 
Vinegar 
availability. . .21-81. 
characteristics ; 
sources 21-80. 
use to control lice 
9-9,10,16; 21-80. 
Vinegerones (see Whip 
scorpions) 
Wasp nests 
control 15-14,15. 
location. . . .15-12,13. 
Wasps 
classes 15-12. 
control 
social 15-14. 
) solitary 15-12. 
parastic 15-12. 
references 15-15- 
social 15-13. 
solitary 15-12. 
Washing soda 
other names; uses; 
cost; availability 
21-81. 
Webbing clothes moth 
(Tineola biselliella ) 
adults J larvae 
(illus.) 3-3. 
control. . .3-9; 21-66. 
damage. . . (illus. )3-4. 
description 3-2. 
development 3-7. 
silken tubes 3-2. 
Wetters 
use in insecticidal 
sprays 21-5. 
