- 100 - 
other plants containing rotenone, are as follows: acetone, "benzol, chloro- 
benzene, chloroform, dichloroethyl ether, ethylene chlorohydrin, n-propyl 
formate, toluene, trichloroethylene and xylene. 
Mike ska (282), in U. S. patent 2,066,194, issued December 29, 1936, 
applied for October 29, 1932, assigned to the Standard Oil Development 
Co. , claims an improved insecticide, comprising a hydrogenated extract 
obtained by extracting petroleum oil with a solvent having a preferential 
solvent action for aromatic and unsaturated hydrocarbons of a petroleum 
oil, separating the solvent from the extract, hydrogenating the separated 
extract, and dissolving in the hydrogenated extract the active principles 
of a fish poisoning plant. For example, kerosene having a solvent power 
for rotenone and/or rotenoids of from 0.25 to 0.05 percent was extracted 
with sulphur dioxide. The extract was separated from the solvent by means 
of distillation, and the solvent power for rotenone was found to be in- 
creased to 2.3 percent. The extract was then hydrogenated, and marked 
improvements both in the odor and the solvent po?/er were found. The 
solvent power of the hydrogenated extract for rotenone and/or rotenoids 
was increased to 7.2 percent. 
The hydrogenated extract is suitable for use as a solvent in ex- 
tracting the toxic ingredients from the fish poisoning plants, by percola- 
tion or by maceration of the plant in the presence of the solvent and 
separating the solvent containing the toxic ingredients from the residual 
solids. 
The hydrogenated extract with the toxic ingredients in solution 
may be diluted and used as a spray in killing insects, such as flies, 
mosquitoes, etc. 
A spray of the emulsion type may be prepared for dipping and 
spraying animals to control external parasites, such as lice, ticks, mange 
mites, cattle grub, etc. The emulsion for cattle dips or sprays is 
prepared by taking hydrogenated oil extract solution containing 5 to 10 
percent of rotenone and/ or rotenoids and mixing with water, using a 
suitable emulsifier such as oil-soluble sulphonated soap, fish oil soap, 
saponin, etc. Other insecticides may be added to the emulsion, such as 
lead arsenate, nicotine, pyrethrum, etc. 
Another use for the spray solution of the emulsion type is for 
spraying plants such as trees, shrubs, etc. to control parasites such as 
aphids, leaf hoppers, thrips, greenhouse white flies, tent caterpillars, 
red spiders, squash bugs, roaches, Mexican bean beetles, Japanese beetles, 
potato beetles, etc. 
This invention relates to the art of manufacturing improved in- 
secticides or insect repellents containing novel solvents for toxic 
ingredients and more particularly it relates to the use of improved sol- 
vents for the toxic ingredients of fish poisoning plants known as derris, 
cube, etc. The non-crystalline constituents of fish-poisoning plants 
known to be a mixture of deguelin, tephrosin, toxicarol. etc. ^.are called 
rotenoids by Mikeska. LJEiRAKY 
STATE PLANT BOARD 
