. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. 81.—Head of Cyst cercus Cellulosse X about 40 diameters. The younger pigs are especially attacked, and duringlife the earliest evidence is aflorded of the parasites, bythe presence of one or more small cysts in the conjunc-tiva, or in the loose tissue of the frsenum linguae. Afterdeath the liver, and the muscles of the shoulders inter-costals and loins, are seen to be chiefly aflected. MEAT. 357 The cysticercus of the ox—Cy
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . Fig. 81.—Head of Cyst cercus Cellulosse X about 40 diameters. The younger pigs are especially attacked, and duringlife the earliest evidence is aflorded of the parasites, bythe presence of one or more small cysts in the conjunc-tiva, or in the loose tissue of the frsenum linguae. Afterdeath the liver, and the muscles of the shoulders inter-costals and loins, are seen to be chiefly aflected. MEAT. 357 The cysticercus of the ox—Cysticercus bovis or beef-measles—chiefly affects the calf; it possesses a flathead armed with no booklets, but simply suckers,around which there is frequently a considerable depositof pigment. It develops into the adult tape-wormcalled Taenia mediocanellata, which appears to bemore prevalent in this country than Taenia solium. Trichina spiralis.—This parasite has been foundin the flesh of many different animals, but most com-monly, by far, in that of pigs ; oxen and sheep do notsuffer from attack by these Fig. 82.—Trichina Spiralis, encysted in muscle X about 40 diameter. The shape of the minute worms is nearly that of atypical nematode, , a slender rounded body tapersgradually at either end ; the extremity which consti-tutes the head, goes to a long slender point whichpresents a small central orifice—the mouth ; the otherextremity, the tail, ends more bluntly. The wormspossess a distinct alimentary canal, and even rudimen-tary sexual organs are present; in the female an uterusis discernible, which will frequently be seen to be fullof minute free embryos curved upon themselves ; these 358 LABORATORY WORK. latter have been observed to become extruded from thevagina, and subsequently to move sluggishly about thefield of the microscope. The male worm is muchsmaller than the female, and is only about -^^ inch longwhen mature; the latter reaches i inch. Th
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