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[From the Report of the Connecticut Roard of Agriculture for 1870.] 
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‘The External Parasites of Domestic Animals, 
THEIR EFFECTS AND REMEDIES.* 
BY A. 5. VERRILL. 
The external parasites of our domestic animals nearly all 
belong to the great class of animals which we call Insects, but 
the internal parasites are, with few exceptions, representatives 
of the classof Worms. The division of the subjects of these 
lectures is, therefore, both convenient and natural. 
The class of Insects includes a far greater number of spe- 
cies than any other class of animals, the number actually 
amounting to several hundred thousands, each country having 
‘avast number peculiar to itself. They are also exceedingly 
diverse in habits, as well as in form and structure. 
In. order to show the affinities of the insect-parasites and. 
their position among other insects, it will be necessary to give 
a brief sketch of the whole class, with a few remarks on the 
more important peculiarities of their anatomy. 
All insects, like the other articulated animals (worms and 
crustacea), have a body composed of a series of segments or 
rings, placed one behind the other, and together forming a 
sort of irregular tube, which incloses in one cavity all the in- 
* In the preparation of the reports of these lectures on the parasites of domes- 
tic animals, we are greatly indebted to Dr. A. 8. Packard for the use of many 
cuts of insects from his excellent “Guide to the Study of Insects” and the 
“ American Naturalist,” published at Salem, Mass.; and to Donald G. Mitchell, 
.. Esq., editor of the “Hearth and Home,” published by Pettingill, Bates & Co., New 
York, for the use of several excellent cuts of parasitic’worms, prepared to illus- 
trate a series of articles on parasites of man and domestic animals by the writer, 
Without this assistance tlie lectures could have been illustrated only imperfectly, 
In addition to these we have added, so far as the available funds would admit, fig- 
ures of the more important parasitic insects and worms, copied from Cuvier, Gue- 
rin, Clark, Leuckart, Cobbold, and others.—A. EZ. Vervill. 
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