. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . the eyes and the under surface of the tongue,both of which will frequently show the small pin-headnodules. The dangerous and often fatal condition created bythese worms as they traverse the gastro-intestinal wallsand travel to their encystment in the various organs ofthe body, is termed Trichiniasis, a disease most pre-valent in those countries where the uncooked—or im- 360 LABORATORY WORK. perfectly cooked—flesh of the pig is c
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . the eyes and the under surface of the tongue,both of which will frequently show the small pin-headnodules. The dangerous and often fatal condition created bythese worms as they traverse the gastro-intestinal wallsand travel to their encystment in the various organs ofthe body, is termed Trichiniasis, a disease most pre-valent in those countries where the uncooked—or im- 360 LABORATORY WORK. perfectly cooked—flesh of the pig is consumed, as in theform of sausages, &c. The symptoms of the diseaseresemble those of what a hybrid of acute rheumatism,enteric fever, and pyaemia may be imagined as pro-ducing. Hot smoking, and eflicient cooking, destroys theseparasites; but in the latter case the meat must be done through, , thoroughly cooked through thecentre—or the parasites in this part of the joint, es-pecially when shielded by calcareous walls, may escapethe temperature necessary to destroy them, , that of150° to 160° F. There are small, semi-transparent, bodies called. Fig. 83.—One of Raineys Capsules. (X 2^5)- Psorospermia or Raineys Capsules, which some-what closely resemble trichinae, presenting as they dosmall oval or elliptical bodies, of similar sizes to en-cysted trichinae. They are, however, made up of athick membrane formed by small hair-like fibres ar-ranged in lines, which encloses small oval— or ratherkidney-shaped—granular cells closely adherent together,and the whole lies embedded in the muscle substanceitself, , the sarcolemma. They are extremely com-mon, and may exist in the flesh of most of the animalsused for human consumption, and apparently wheneaten they do not harm the human being. MEAT. 361 Several more obscure bodies, the nature and signifi-cance of which we are still more in the dark about, may-exist in flesh ; such as bodies somewhat resembling puscells
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