-29- 
For those instances where it is accepted that there is not too great 
a hasard, ttere should be a backlog allotment of DDT for use L 
California in case other pest control materials are not available for 
specific purposes. Suggested backlog counts as ind^teTto be 
allocated for use as needed were estimated as follows: 
Pounds 
Grape leafhopper on grapes before blooming 100,000 
Citrus thrips on citrus ••••••••••••••••••••••••• 20,000 
Codling moth on walnuts ••••••••* •••• 10,000 
Onion thrips on onions ••••••■ ••••••• 50,000 
Cankenvorms on prunes ••••••••••• ••• 10,000 
Worms on vegetable seed crops grown for seed (not 
including onions) • • 15,000 
Thrips on dry beans ••••••• ••••• 15,000 
Protection of animals from pests, including 
spraying dairy barns to reduce flies ••••••••• 25,000 
Experimental purposes •••••• • •••• * 50,000 
Pear thrips infestations are reported to have been extensive in 6 
or 8 counties of California for the past 2 years and a backlog of at 
least an additional 110,000 pounds for this purpose would seem reason- 
able and desirable. Therefore, California agriculture could use approx- 
imately 400,000 pounds or more of DDT in 1945.~Cox (121 ). 
COST 
Early lots of DDT cost the government $1.60 a pound, later #1.00, 
and effective January 1, 1945 Du Pont announced a price of 60 cents.-- 
Peaker (289 ) j also Anon. (8) and Stenerson (335 ) . 
Transportation regulations 
The TJ. S. Interstate Commerce Commission in April 1945 issued list 
CFR 73 revising the transportation rule on DDT, classifying the material 
as poison B, applying sections 352 and 361 on exemptions and packing, re- 
quiring a poison label, and setting a 200-pound maximum for shipment by 
express. On June 29, 1945 the Commission issued an order in Dooket No. 
3666 which removed DDT from the regulation, because as a result of an 
investigation by the U. S. Publio Health Service it has been determined 
that this material is not sufficiently poisonous to be considered a 
class B poison under the regulations.— U. S. Interstate Com. Commis. (555) . 
PATENTS AND TRADE-MARKS 
Patents 
On April 20, 1943 Canadian patenx 411,926 covering a devitalising 
composition was granted Paul Muller (267 ) • This patent is similar to 
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