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This plant was believed to be a mosquito repellent, and this prop- 
erty was thought to be due to the thymol given off by the lepves. 
Evidence of its being a valuable repellent was not convincing.— Anony- 
mous (21) • 
This plant has been said to keep away mosquitoes, but experiments 
have given negative results. — Dalziel ( 112 ) . 
ORIGANUM HIRTUM Link. 
Oil of origanum wps of no value as repellent or attractpnt to the 
screwworm.— Pprman pnd coworkers ( 502 ) . 
ORIGANUM MAJORANA L. Sweet marjoram. 
Extracts were not repellent to the Japenese beetle.— Metzger end 
Grant (277). 
The oil of sweet marjoram (100 p. p.m.) killed 95 percent of the 
mosquito larvae tested. An extract of the whole plant killed only 5 
percent.— Hartzell and Wilcoxon (188 ) • 
PERILLA FRUTESCENS (L.) Britton. Perilla. 
One of the constituents of a patented insecticide was the dried 
ground parts of this plant.— Kimura ( 22 6) • 
PLECTRANTHUS RUGOSUS Wall. 
In India this plant was used as bedding to keep off fleas.— Watt 
(422, v. 6, pt. 1, p. 291). 
POGOGYNE PARVI FLORA Benth. 
Indians placed the culled plants in or about their houses to 
drive away fleas.— Chesnut (89, p. 384). 
POGOSTEi.'OF HEYNEANUS Benth. Synonym: P. patchouli Pellet. Patchouli. 
The lenves when strewed pmong woolen clothes were said to keep 
away insects. --^alzell pnd Gibson ( ill , sup., p. 66) j Hollpnd ( 197 , 
p. 535). 
A mixture of 3 ounces of oil of patchouli and 16 ounces of alcohol 
was claimed as an insecticide (U. S. patent 1,605,202) .— Roark ( 333 , 
p. 70). 
