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Wood ( 171 ) in 1912 reported that a prepare tion made by soaking 2 pounds 
qf crashed fresh derris root in 2 imperial gallons of boiling water for a 
few hours, adding 1 quart of .this to 2 gallons of rater, readily killed ticks 
on do.-rs bathed in it. Dogs suffering from nance should not be treated ruth 
den-is solution. 
On June 15, 1921, W. R. Allen wrote -N. E. Mclndoo, of the Division of 
Insecticide Investigations, Bureau of Entomolory and Plant Quarantine, United 
States Department of Agriculture, that cube was used in Peru as a wash for 
killing parasites. He enclosed a snapshot "-hich showed the ^ashing of a cow 
to kill ticks. 
The Institute of Physical and Chemical Research (78) , Tokyo, Japan, in 
1927 reported results obtained with Neoton at seven agricultural experiment 
stations in Japan, The following tests were made at the Animal Husbandry 
Experimental Station, Chiba, Japan: A solution of 1/2 pound of Neoton and 1 
pound of soap in 20 imperial gallons of water was painted on the skin of 
nine calves of Holstein-Ayrshire strain. All ticks were killed m ithin 28 
hours. Ho injurious action on the calves ^*es noted during and .after the 
experiment,. A solution of 1/2 n'ound of Neoton and 1 pound of soap in 24 or 
28. imperial gallops of water killed all ticks on one mature and three young 
Yorkshire pigs 1 hour after application. This pamphlet on Neoton also records 
tests by Ito, of Bolivar, Argentina, who reported in 1926 that three or four 
applications of Neoton will exterminate skin diseases (sarna or kraze) of 
cattle, and that Neoton has been found to be the most effective of all the 
medicaments now being used in that country. . 
Howes (7j5) in 1930 wrote that en infusion of the roots of Tephrosia 
macro-poda with water was commonly used by early settlers in Natal as a wash 
for freeing dogs from fleas and ticks. 
The IColonieal I n stituut (88) of Amsterdam in 1930 stated that there is 
a good, ground for believing thet derris root contains active materials other 
than rotenone. for instance, some Sumatra root from ^-hich no rotenone could 
be obtained was active. Experiments ^ere made at. the Handelsmuseum of this 
Instituut to test the conclusions arrived at in other countries concerning 
the effectiveness of derris. When dinped in the emulsion, all ticks were 
killed. 
Schmitt ( 134 ) in 1930 reported' that cats, dogs, rabcits, and chickens 
were freed from ticks within 3 to 5 hours after being dusted ^ith dry powder 
of the finely pulverized root of Derris elli^tica . 
Watt and Breyer-Brand^ijk (157) in 1932 st=ted that the Zulus use 
Tephrosia ma cr op oda as a vermin killer. The leaves of _T. vorelii pre said to 
be an efficient parasiticide against fleas, lice, and ticks, and are commonly 
used for this purpose by Europeans in Rhodesia. The Thon<ras use a decoction 
of the root of a species of Tephrosia (probably T. grr-ndi flora ) as a parasiti- 
cide. The preparation is said to have been used for the same purpose by 
transport riders in the early davs of Natal. 
