. Diseases of cattle, sheep, goats and swine. Veterinary medicine. excrements, and are scattered on the ground, either smgly or confined in the escaping segments of the tapeworm. Once upon the ground, they are easily washed along by rain into the drinking water, ponds, or brooks, or scattered on the grass. Upon being swallowed with fodder or water, they arrive in the stomach of the inter- mediate host (cattle, sheep, etc.), where the egg- shells are destroyed and the embryos set free. The embryos then traverse the intestinal wall, and, according to most authors, arrive either ac- tively, by cr
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. excrements, and are scattered on the ground, either smgly or confined in the escaping segments of the tapeworm. Once upon the ground, they are easily washed along by rain into the drinking water, ponds, or brooks, or scattered on the grass. Upon being swallowed with fodder or water, they arrive in the stomach of the inter- mediate host (cattle, sheep, etc.), where the egg- shells are destroyed and the embryos set free. The embryos then traverse the intestinal wall, and, according to most authors, arrive either ac- tively, by crawling, or passively, by being carried along by the blood, in the liver or lungs, where they undergo certain transformations in structure. While still in the finer branches of the blood- vessels of the liver, which they transform into small, irregularly-shaped tubes about 12 to 15 mm. long and 1 to I'o mm. broad, the embryos lose their six hooks, and develop into small, round kernels, which are generally situated at one Fig. 139.—Egg of the niarginate tapeworm (Tcenia marginata), with six-hooked em- bryo, greatly magni- fied. (Stiles, Amiual Eeport of Agriculture, 1901.). Fig. 140.—Portion of the liver of a lamb which died nine days after feeding with eggs of the marginate tapeworm [Tcsnia marginafa), with numerous "scars," due to young parasites. (After Curtice.) end of the tubes. The embryo can first be seen about four days after infection. The " scars " (Figs. 140 and 141) described in the liver of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Moussu, Gustave, 1864-; Dollar, John A. W. , joint author. New York, W. R. Jenkins
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