. Diseases of cattle, sheep, goats and swine. Veterinary medicine. —LIVES FLUKK DISEASE—LIVER KOl\ 293 animals infested with Cii^ircrciis tniuicolUs are nothing more nor less than these tubes, or altered blood-vessels, caused by the growth and wandering of the parasites. Curtice takes a somewhat different view—that is, he considers the Hver as a place of destruction for the young parasites, rather than a normal place for their development; he also claims that the embryos, which may even travel the entire length of the intestine of the inter- mediate host, traverse the intestine a
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. —LIVES FLUKK DISEASE—LIVER KOl\ 293 animals infested with Cii^ircrciis tniuicolUs are nothing more nor less than these tubes, or altered blood-vessels, caused by the growth and wandering of the parasites. Curtice takes a somewhat different view—that is, he considers the Hver as a place of destruction for the young parasites, rather than a normal place for their development; he also claims that the embryos, which may even travel the entire length of the intestine of the inter- mediate host, traverse the intestine and arrive directly in the position where they complete their larval development without first passing through the liver. After developing into the full-grown bladder worm, the parasites remain unchanged until they are devoured by a dog or wolf, or until,. Fig. 141.—Cross-section of the liver of a lamb which died nine days after feeding with eggs of the niargmate tapeworm [Tcoiia marginata). (After Curtis.) after an undetermined length of time, they become disintegrated and more or less calcified. If the hydatid is devoured by a dog or wolf, either when the latter prey upon the secondary host or when the dog obtains the cyst at a slaughter-house, the bladder i^ortion is destroyed, the scolex alone remaining intact in the digestive fluids. The head holds fast to the intestinal wall with its suckers and hooks; by strobilation (transverse division) it gives rise to the segments, which as we have already seen, together with the head, go to make up the adult tapeworm. Eepro- ductive organs of both sexes develop in the separate segments, and eggs are produced, within which are developed the six-hooked embryos, the point from which we started. DISTOMATOSIS-LIVER FLUKE DISEASE-LIVER ROT. In France the name of distomatosis has been given to a disease caused by the presence of distomata in the bile ducts. It is the " liver rot " of England, the Eberfaule of Germany, and
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