. The external and internal parasites of [man and] domestic animals. Figure 50.—Young tapeworm from measles of pork; and Fig. 51, head of same,more enlarged; Hearth and Home, after Owen. Figure 52.—Pork tape-worm (Tccnia soHum). less than natural size; Hearth andHome, after Owen. PARASITES OF ANIMALS. 71 , measles in pork (Figure 49). These are cavities or cystsproduced by inflammation, containing whitish fluid and enclos-ing small, bladder-like, translucent, vesicles, filled with a wateryfluid, and which contain the proper head and neck of the youngworm coiled up spirally in the interior in a
. The external and internal parasites of [man and] domestic animals. Figure 50.—Young tapeworm from measles of pork; and Fig. 51, head of same,more enlarged; Hearth and Home, after Owen. Figure 52.—Pork tape-worm (Tccnia soHum). less than natural size; Hearth andHome, after Owen. PARASITES OF ANIMALS. 71 , measles in pork (Figure 49). These are cavities or cystsproduced by inflammation, containing whitish fluid and enclos-ing small, bladder-like, translucent, vesicles, filled with a wateryfluid, and which contain the proper head and neck of the youngworm coiled up spirally in the interior in an inverted gentle pressure the head and neck may be made to protrudeby inversion, like the finger of a glove, and will then presentthe appearance shown in figure 50, the vesicle of fluid nowforming the flask-like caudal portion of the worm. The headmay now be seen to have four suckers and a central promi-nence surrounded by two circles of hooks, as in the adult. Inthis condition, enclosed in the cysts, they will remain living Figure 53. Figure for a long time in the hog, even surviving the death of theirhost for a considerable period. If one or more of these youngworms or measles be swallowed by a human being, the mus-cular fibres and the cysts will be digested, and each youngworm thus liberated will evert its head, and losing its bladder-like portion, will pass into the intestine. There it will fastenitself to the inner membrane by its suckers and hooks, andgrow rapidly by absorbing the digested food by which it issurrounded. New joints will be rapidly formed as the olderones grow larger, until it becomes a mature tape-worm, withjoints ready to be cast off. There may be but one tape-worm in Figure 53. Head of Tcenia solium, magnified. From 54.—A joint ov proglottis of Tcenia solium, magnified ; a, branches of theuterus ; h, external oiifice; c, male organ. From Cobbold. 72 BOARD OF AGRICULTURE. the human intestine, or there may be several
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectparasit, bookyear1870
