. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 300 DISEASES OF THE LIVER. in the snail for a longer or shorter time, or passes out of the body of the snail and swims about in the water. After a time it attaches itself to a blade of grass (Fig. 154) or some other object, and forms a cyst around itself with material from the large glands, at the same time losing its tail. It now remains quiet until swallowed by some animal. Then, upon arriving in the stomach—of a steer, for instance —the cj^st is destroyed, and the young parasite wanders through the gall-ducts or, as some bel
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 300 DISEASES OF THE LIVER. in the snail for a longer or shorter time, or passes out of the body of the snail and swims about in the water. After a time it attaches itself to a blade of grass (Fig. 154) or some other object, and forms a cyst around itself with material from the large glands, at the same time losing its tail. It now remains quiet until swallowed by some animal. Then, upon arriving in the stomach—of a steer, for instance —the cj^st is destroyed, and the young parasite wanders through the gall-ducts or, as some believe, i^^-odi. Fig. 156.—Drawing fiora a microscopic preparation, showing a haemorrhage in the parenchyma of the hver caused by the common liver fluke {Fasciola hepatica). a, Atrophic hver tissue ; h, round-cell infiltration ; c, a portion of the parasite; d, haemorrhage. (After Schaper, 1890, PL I., Fig. 1.) through the portal veins to the liver, where it develops into the adult hermaphrodite. From the above we see that this parasite runs through three genera- tions, namely: (1.) Ovum, miracidium, and sporocyst . . first generation. (2.) Redia . . second generation. (3.) Cercaria and adult . . third generation. During this curious development, which lasts about ten to twelve weeks, there is a constant potential increase in the number of individuals, for each sporocyst may give rise to several (five to eight) redijE, each redia to a larger number (twelve to twenty) cercarise, and each adult to an. 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, Jno. A. W. (John A. W. ). Chicago : American Veterinary Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectveterin, bookyear1920
