Notices of Books. 9351 
especially into the striated muscles, where, unless the animal in which 
they are contained should previously die, they are, after a-time, 
encysted, and wait for the moment when they may be eaten by another 
man or animal to undergo the same changes as before.” Thus writes 
our author, and probably with truth, but in how many instances must 
they wait in vain; for notwithstanding what I have already said of cats 
and pigs being consumed by man, surely with man himself the race 
must terminate, for what animal devours human flesh in these regions 
where sepulture is universal! Still this branch of the inquiry is 
scarcely worth pursuing, since other animals, as Musca yomitoria are 
known occasionally to perish by thousands in the coffin that contained 
their pabulum. 
Flesh containing Trichine when once received into the stomach “ is 
dissolved by the gastric juice, and the Trichine become freed from 
their cysts. * * * They begin to move about; they lose their 
spiral figure, and become stretched, so as to appear somewhat similar 
to Ascarides. They soon grow rapidly, * * and atthe same time 
generative organs are developed.” The males and females are readily 
distinguishable, and it seems to be ascertained that after the impreg- 
nation of the females the males die, for although at first the sexes are 
nearly equal in number, from ten to fourteen days after the infected 
meat has been eaten the males have entirely disappeared, females only _ 
remaining. “Six weeks after feeding [? after the infected flesh has 
been eaten] no trace of either males or females is to be discovered in 
the intestines.” Each female contains from three hundred to five 
hundred ova, which, like those of a bird, are found in a state of suc- 
cessive development, so that many days elapse between the extrusion 
of the first and last of this large family; the embryo is born in an 
active and worm-like state, very considerably resembling its parent. 
“Soon after birth the [juvenile] Trichine leave the intestines and 
migrate into the peritoneal sac ;” on their passage “ they have to per- 
forate the coats of the bowel, which, on account of their minute size, 
they probably accomplish without tearing the membranes, but merely 
driving them as it were asunder,” a description which I do not precisely 
comprehend. “This process,” continues the author, “is facilitated 
by the shape of their head, which may, under certain circumstances, 
become sharply pointed. From the peritoneal sac they proceed to all 
the striated muscles, excepting only the heart, in which they are 
scarcely ever found. They arrive in the muscles in about ten days 
after their parents have been eaten, and penetrate through the sarco- 
lemma into the interior of the muscular substance, which is by their 
