commonly found in America and all
the countries of Europe, except France, Russia, and Switzerland. In
France, both species are found, but the taenia lata seems to be
indigenous to Russia and Switzerland.

The _taenia solium_ varies in length from four or five to thirty,
thirty-five, or even forty feet. The head is hemispherical and armed
with a double row of twenty or thirty hooklets. The genital organs are
alternate and placed upon the outer edges of each segment. It inhabits
the small intestine, and is usually solitary.

(5.) The _taenia lata_, or broad tape-worm, is distinguished by the
greater breadth of its segments, and the location of the genital organs,
which are found in the centre of each segment. Its small elongated head
is unarmed, and has a longitudinal fissure on each side. It usually
attains a greater length than the _taenia solium_.

SYMPTOMS. The symptoms which the long worms occasion, are frequently
somewhat obscure. Thirst, irregular appetite, colicky pains, excessive
flow of saliva, enlargement of the abdomen, itching of the nose, pallor
of the face, offensive breath, disturbed sleep, and grinding of the
teeth, all are common symptoms. Occasionally, convulsions and other
nervous affections are produced by the presence of the _ascaris
lumbricoides,_ but generally they produce less constitutional
disturbance than the other varieties. The passage of this species of
worms from the bowels, or their ejection from the stomach, is the only
positive evidence of their presence. The _ascaris vermicularis_, thread,
pin, or seat-worm, gives rise to most of the symptoms produced by the
long worms, but in addition produces intense itching at the anus, and,
not unfrequently, an eruption upon that part. The itching is
particularly distressing at night. When the little sufferer is well
covered, the warmth occasioned by the bed-clothes causes these little
parasites to crawl out upon the anus, and produces such paroxysms of
itching and pain as to cause the child to kick the covering oft and lie
naked. The persistent manifestations of a disposition to lie naked,
should excite the parents' suspicions of seat-worms, and lead them to
investigate all the symptoms. By examining the child's stools the worms
may he found adhering to the feces, and they may also be seen on the
anus. Thousands of children suffer untold agony from these little
seat-worms, which are left unmolested to torment them, because the
parents are unfami