PARASITES OF ANIMALS. 51 
The same spécies, or one very closely allied to it, occurs in 
the skin of the dog and other domestic animals, producing 
some forms of the ‘‘mange.” These parasites will probably 
be destroyed by the same remedies that are effective against 
the itch-insect. 
SHCOND LECTURE. 
The Internal Parasites of Domestic Animals;. 
THEIR EFFECTS AND REMEDIES. 
The parasites of man are so intimately connected with those 
of his domesticated animals, that it is impossible to discuss 
them separately. Indeed, many of the human parasites in- 
habit also the hog, cattle, sheep, and the dog, in certain stages 
of their development, and nearly all the most dangerous kinds 
are derived, either directly or indirectly, from those,animals. 
While in return mankind furnish to them the eggs of several 
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