CHAPTER VII. 
REMEDIES—PREVENTIVE TREATMENT |! 
There are so many of the external parasites of domesticated animals, 
which, even though very widely different in structure and affinities, 
have very similar habit and can be reached by practically the same 
treatment, that a chapter devoted especially to general treatment will 
be of special importance. We may consider the subject under the 
}. heads of ‘Preventive measures,” ‘Insecticidal substances,” and 
‘‘Methods of application of remedies.” 
PREVENTIVE MEASURES. 
| Prevention is for a large number of parasitic forms by far the most 
desirable plan. For some it is the only plan that can be of any service 
in avoiding injury. 
The attacks of semiparasitic forms, as mosquitoes, flies, buffalo- 
ie gnats, etc., may be abated by operating upon their breeding places 
|" and, further, their direct attacks upon animals, where the number to 
\ be protected is not too great, may be prevented in some degree by 
ib smearing the hair of the animals with preparations of fish oil, tar, train 
ie oil, and axle grease. Pennyroyal is also recommended as beneficial. 
For the bot-flies it is important to destroy the eggs before the larve 
hatch by shaving or clipping off those noticed on horses, or washing 
them with kerosene emulsion, carbolic acid solution, dipping solution, 
or, if a dipping vat is available, by swimming the animals through the 
vat. | 
Ls For the constant external parasites, as lice, itch mites, etc., quaran- 
: tine of all animals introduced into a herd or thorough treatment of 
such animals to prevent infection of a herd that is free cannot be too 
strongly urged. Itis the most practical protection against these pests. 
INSECTICIDAL SUBSTANCES. 
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: 
| In this enumeration of substances which may be used in treating 
insects affecting domestic animals, the aim shall be to include all that 
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have a real value in this direction, either individually or in combination, . 
and to indicate their valuable properties and very briefly the forms to | 
which they may be applied. 
Arsenic, a deadly poison, is used in some of the dipping solutions and 
‘Dr. D. E. Salmon, Chief of the Bureau of Animal Industry, has very kindly read 
and revised this chapter.—L. O. H. oe 
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