-133- 
A 2-percent emulsion of citral (a constituent of the oils of lemon 
and orange? killed 95 percent of the bean aphids sprayed. — Richardson 
and Smith (323 , p. 608). 
CITRUS SINENSIS (L.) Osbeck. Orange. 
Orange poultice was recommended in some skin affections, such as 
psoriasis. --Watt (422 , v. 2, p« 344). 
Oil of orange was strongly attractive to the oriental cockroach. 
A bait was made of 6 gm. of gelatin, 200 cc. of dilute beef broth, 0.5 
gm. of mercuric chloride, and 1 drop of oil of sweet orange. — Cole ( 101 ) • 
CITRUS sp. 
This plant was used in Haiti as an insecticide against mosquitoes.— 
Roark ( 352 , p. 9). 
CLAUSENA ANISATA Hook. f« Samanobere. 
In the Gold Coast, Africa, this plant was commonly hung in houses 
to keep away mosquitoes .—Irvine (213 ) . 
PHELLODENDRON AMURENSB Rupr. Amur corktree or velvet tree. 
Petroleum-ether extracts of this tree showed considerable toxicity 
to mosquito larvae and when tested in acetone solution to adult house- 
flies. When dissolved in high-boiling kerosene, such as is used in fly 
sprays, the extracts showed practically no toxicity. The commercial use 
of these extracts for controlling houseflies therefore does not seem 
practical. Chemical fractionation of the extract gave fractions that 
were much more toxic to houseflies when tested in acetone than the 
original extract .--Sullivan and coworkers (387 ). 
The residue of the fruit, after removal of the oil, showed con»- 
siderable toxicity against mosquito larvae, houseflies, and codling moth 
larvae (apple-plug method). The extract was more toxic than derris 
(5.2 percent rotenone) to mosquito larvae, and to houseflies about as 
toxic as derris. In a single spray test the material showed low toxic- 
city to southern armyworms, but this also applied to derris and pyre- 
thrum. Like pyrethrum and nicotine, the material is a fast-acting poi- 
son. — Haller ( 178 ). 
The fruit of this tree of Japan was toxic to codlinp- moth larvae 
and mosquito larvae in laboratory tests.— Roark ( 341 ; 34 2 , p. 14). 
The Amur corktree, native to several Asiatic countries, was intro- 
duced into this country in 1856. Specimen trees may be found in Washing- 
ton, D. C«, and Boston, Mass. The unsaponifiable portion of the oil of 
