Boys' heads are apt to be
lousy, but men's in less degree; and women are more subject to lice
than men. But, whenever people are troubled with lousy heads, they are
less than ordinarily troubled with headache. And lice are generated in
other animals than man. For birds are infested with them; and
pheasants, unless they clean themselves in the dust, are actually
destroyed by them. All other winged animals that are furnished with
feathers are similarly infested, and all hair-coated creatures also,
with the single exception of the ass, which is infested neither with
lice nor with ticks.
Cattle suffer both from lice and from ticks. Sheep and goats breed
ticks, but do not breed lice. Pigs breed lice large and hard. In
dogs are found the flea peculiar to the animal, the Cynoroestes. In
all animals that are subject to lice, the latter originate from the
animals themselves. Moreover, in animals that bathe at all, lice are
more than usually abundant when they change the water in which they
bathe.
In the sea, lice are found on fishes, but they are generated not
out of the fish but out of slime; and they resemble multipedal
wood-lice, only that their tail is flat.
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