. Animal parasites and messmates. Parasites. TRANSMIGRATIONS AND METAMORPHOSES. 223 develops itself on the brain of tlie sheep, and occasions the disease known by the name of "; This disease may be produced artificially. The sheep which swallows the eggs of this taenia shows the first symptoms of it towards the seventeenth day. If we kill it at this time, we find on the surface of the brain, either at the base or the summit, or sometimes between the hemispheres and the cerebellum, one or more white vesicles of the size of a pea, and on which no traces of buds are yet to be seen.
. Animal parasites and messmates. Parasites. TRANSMIGRATIONS AND METAMORPHOSES. 223 develops itself on the brain of tlie sheep, and occasions the disease known by the name of "; This disease may be produced artificially. The sheep which swallows the eggs of this taenia shows the first symptoms of it towards the seventeenth day. If we kill it at this time, we find on the surface of the brain, either at the base or the summit, or sometimes between the hemispheres and the cerebellum, one or more white vesicles of the size of a pea, and on which no traces of buds are yet to be seen. This vesicle, of a milky-w^hite colour, and filled with liquid, is the scolex. Near these vesicles are to be seen some very irregular yellow furrows, like tubes abandoned by some tubicolar annelid; this is the gallery through which the vesicular worm has proceeded to the place where it has been found. A fortnight later, that is to say, about the thirty- second day, the coenurus is as large as a small nut, and one can see with the naked eye some small nebulous cor- puscles, separate fi'om each other, of the same form and size; these are the buds or scolices which have risen up, but which, as yet, have neither hooks nor suckers. We give the representa- tion of one of these vesicles, on the internal walls of which young scolices have been developed; this is nearly of the natural size. Fig. 2, a, a, shows these scolices of .nearly. Fig. 54.—CcEuurusof the sheep. 1, the enclosed scolex; 2, Hydatic vesicle, with the scolices in their place within 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 Beneden, M. van (Pierre Joseph), 1809-1894. New York, D. Appleton and Company
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectparasit, bookyear1876
