The care of animals : a book of brief and popular advice on the diseases and ailments of farm animals . h exudes from irritatedtissues to which the worm may be attached. Intestinal and related worms may be divided intofour classes: the flat, segmented, and usually long,tape-worm ; the flat, lance-shaped fluke-worms, foundin the liver; the thorn-headed round-worms; and thecommon round-worms. The tape-worms (Fig. 53) are usually long, often mea-suring many feet, but in some cases they may not be overa half inch in length. Part of their life-history is as fol-lows : The adult worm infesting the i
The care of animals : a book of brief and popular advice on the diseases and ailments of farm animals . h exudes from irritatedtissues to which the worm may be attached. Intestinal and related worms may be divided intofour classes: the flat, segmented, and usually long,tape-worm ; the flat, lance-shaped fluke-worms, foundin the liver; the thorn-headed round-worms; and thecommon round-worms. The tape-worms (Fig. 53) are usually long, often mea-suring many feet, but in some cases they may not be overa half inch in length. Part of their life-history is as fol-lows : The adult worm infesting the intestine of the host 342 The Care of Animals. Fig. 53. Head and sectionof tape-worm. deposits eggs which pass out with the excrement. Whenthese eggs are taken into another animals system,either in the food or the water, they hatch into aminute, migratory, larval form, that bores its waythrough the tissues until it reaches some suitable place,often in the muscle, where it becomes encysted. Thesecysts are small, rounded, yellowish masses, containing the worm-like structurethat is often visible tothe naked eye. Thesecysts, when observed inthe muscular tissue ofpork, chicken, duck,etc.,are commonly calledmeasles, and the meat is said to be measly (page 351).In fish, the encysted forms of worms found in the mus-cular tissue are commonly called grubs, or cycle of the round-worms found in the intes-tines is as follows : The ^gg deposited by the adultpasses out with the excrement, and gets into thefood or water which may be eaten by other animalsIn some instances, it is necessary that the egg be takenin by a certain animal, in
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