X! 
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"The products thus produced may he mixed, if de- 
sired, with any powdered materials which act as wetting 
agents, such as soap, alkali salts of sulphonated hydro- 
carbons or alcohols, sulphonated oils, et cetera. 
"Fillers such as starch, glue, gums, dextrins, flour, 
clays, talc, bentonite, chalk, diatomaceous earth, et cetera ■ • 
may also he incorporated therein if desired. 
"The maximum results aro obtained with these insecti- 
cides when treated in this manner. 
"The phenols referred to above may be one or more of 
the dihydric phenols such as catechol, resorcinol and 
quinol and their homologues, and the trihydric phenols such 
as pyrogallol, phloroglucinol and hydroxy quinol and their, 
homologues." .' . . 
Examples are: (A) 12*5 parts by weight of rotenone are mixed 
ith 87,5 parts by weight of resorcinol in a vessel equipped with a 
heating arrangement. Heat is applied, and when melted the contents are 
withdrawn and allowed to cool. The product is then ground in a suitable 
grinding mill. This material is miscible with water in all proportions 
and when so mixed is highly toxic to most insects. (B) Twelve and 
one-half parts by weight of dry hydrogenated dcrris extract are melted 
with 43.75 parts by weight of resorcinol. The cooled product is ground 
to a fine powder and mixed- with 50 parts by weight of powdered soap. 
The resulting product when mixed with water is quickly dispersed and 
yields a most satisfactory horticultural spray. (C) Ten parts by weight 
of dihydrorotenone are melted with 90 parts by weight of pyrogallol. 
The resulting product when ground and dissolved in water yields a 
valuable insecticide that may be used for mothproofing woolen materials. 
Organic solvents mentioned as suitable for dissolving the active 
principles of Derris, Lonchocarpus , Spatholobus, etc., are ethyl acetate, 
benzol, acetone, chloroform, ethylene dichloride and safrol. 
Ward (456), in United States patent 2»056,"438, issued October 6, 
1936, applied for September 4, 1935, in England March 30, 1935, claims 
the process for extracting toxins for the manufacture of insecticides 
from Barbasco ro*t, comprising the steps of treating the root, in a 
broken up state, with common alcohol in the proportion of 100 grams of 
the root to 400 cc. of common alcohol to which is added 1.5 percent by' 
volume 9f chemically pure sulphuric acid, allowing the mixture to digest 
under the action of the internal heat generated, the common alcohol 
dissolving out the rotenone, tephrosin, deguelin and toxicarol, raising 
the temperature of the mixture by heat -derived from an external source, 
filtering the mixture, neutralizing the filtrate by adding sodium 
carbonate thereto, refiltering, this final filtrate containing not only 
the rotenone but also the deguelin, tephrosin and toxicarol, and mixing 
the final filtrate with soft soap. Reference is made to the process of 
obtaining rotenone by extracting the roots with ether and recrystal- 
izing from carbon tetrachloride. This invention relates to the 
