. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 468 NERVOUS SYSTEM. varying between that of a pin's head and that of a lentil or a small hazel-nut. Later the tracts, with their caseons contents, disapi^ear, and the development of many of the vesicles proves abortive. At the end of a month the vesicles, continuing to develoj) regularly, attain to about the size of a pea. Between the fiftieth and sixtieth days heads or scolices appear in the interior of the vesicle, which then reaches the. Fig. '211.—Brain of sheep. Ccenurosis of the left hemisphere, ffistrus larvse exposed by
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 468 NERVOUS SYSTEM. varying between that of a pin's head and that of a lentil or a small hazel-nut. Later the tracts, with their caseons contents, disapi^ear, and the development of many of the vesicles proves abortive. At the end of a month the vesicles, continuing to develoj) regularly, attain to about the size of a pea. Between the fiftieth and sixtieth days heads or scolices appear in the interior of the vesicle, which then reaches the. Fig. '211.—Brain of sheep. Ccenurosis of the left hemisphere, ffistrus larvse exposed by trepanation. dimensions of a hazel-nut. From this time the vesicles continue to increase in size until the death of the patient. Usually they become as large as a walnut, or even larger, and the interior contains hundreds of scolices, each showing a head. The cystic phase only develops completely in animals whose brains contain a limited number of cysts, and in such the signs of turn-sick are well developed. In others, where the numbers are large (ten to fifteen embryos or more), death occurs during the primary stage, usually towards the end of the first month, in consequence of acute encepha- litis and without any of the symptoms of turn-sick. The number of animals attacked is sometimes enormous. Moussu. 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. ), joint author. New York, W. R. Jenkins
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