888 
Journal o f Agricultural Research' 
Vol. XXXI, No. ft 
complete as to the efficiency of the material as a larvicide, its effect 
on wounds, and toxicity to animals. In no case has any indication 
of toxicity to the animals or ill effects on the wounds been reported. 
In a few instances the reports were to the effect that benzene was 
slow to kill the worms in some cases. These probably were cases in 
which the wounds were not well drained and were not cleaned before 
benzene was applied. Most of the men feel that it is a very efficient 
larvicide and, on account of the effect on wound and animal, prefer 
it to any other they have ever used. 
AVAILABILITY AND PRICE 
Benzene used in the work has been of the grades known in the 
trade as “commercially pure” and “90 per cent.” These grades are 
available to the trade in amounts that will be far beyond the demand 
for larvicidal purposes, and the source is practically inexhaustible. 
Commercially pure benzene is usually about 2 cents per gallon 
cheaper than the 90-per cent in quantity lots. Quotations on the 
commercially pure benzene, for June, 1924, in tank lots, were as low 
as 21.5 cents per gallon; in drums, 28 cents per gallon; these prices 
at production centers. 
CONCLUSIONS 
Benzene is an effective larvicide for the screw worm, when used 
properly. It has no ill effects on the wounds, and acts as a styptic 
temporarily to make the wound less attractive to the adult flies. 
When used in wounds as a larvicide for the screw worm it has not 
been found to be toxic to any animal. 
