. First lessons in zoology. Zoology. 148 FIRST LESSONS IN ZOOLOGY The IbrmiiiL;" rif these thousands of tin}' cysts injures the muscles and causes great pain, sometimes death to the host. Such infested muscle or flesh is said to be " trichi- nosed," and the flesh of a trichinosed human subject has been estimated to contain 100,000,000 encysted worms. To complete the development of the encysted and sexless Trichinre the infested flesh of the host must be eaten b}- another animal in which the worm can live, , the flesh of man b)' a pig or rat, and that of a pig by man. In. Fk;
. First lessons in zoology. Zoology. 148 FIRST LESSONS IN ZOOLOGY The IbrmiiiL;" rif these thousands of tin}' cysts injures the muscles and causes great pain, sometimes death to the host. Such infested muscle or flesh is said to be " trichi- nosed," and the flesh of a trichinosed human subject has been estimated to contain 100,000,000 encysted worms. To complete the development of the encysted and sexless Trichinre the infested flesh of the host must be eaten b}- another animal in which the worm can live, , the flesh of man b)' a pig or rat, and that of a pig by man. In. Fk;. 110.—Tapeworm; head magnified, at left; wliole worm may be beveral yards long. (After Leuekart.) such a case the cysts being dissolved by the digestive juices, the worms escape, develop reproductive organs and produce young, which then migrate into the muscles and induce trichinosis as before. But, however badly trichinosed a piece of pork may be, thorough cooking of it will kill the encysted trichina;, so that it ma}' be eaten without danger. Some people, however, arc accustomed to eat ham, which is simpl}- smoked pork, A\ithout cook- ing it, and in such cases there is al\\'a}-s great 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
