those of the neck, larynx, abdomen, and loins. The fore part is more infested by trichinæ than the hinder part, but in very bad cases they are found everywhere, even in the hams. _Remedies_: (1) The swine must be prevented, as far as possible, from taking up trichinæ, and therefore must never be given the offal from other slaughtered swine. The flesh of trichinous swine should be burnt, and not buried, lest dogs or other animals should eat it and spread trichinosis. (2) Care must be taken that no trichinous pork is eaten by human beings (microscopic examination; meat inspection). Pork (or sausages) must never be used raw or half cooked. Trichinæ are killed by a temperature of 140° to 150° F. The _inside_ of the piece of meat must be exposed to this temperature. Family: =Filaridæ= (_Slender Thread Worms_). Elongated and thread-shaped. Round mouth. Do not infest the gut or other cavities, but the tissues of the body, chiefly connective tissue. None of the species require notice here. Family: =Ascaridæ= (_Round Worms_). Relatively shorter than the worms of the preceding family. Mouth triangular, surrounded by three teatshaped lips. In the male the hinder end of the body is usually bent in a hook-like manner. The anus is not placed quite at the hind end of the body. All the species inhabit the alimentary canal (Cf. p. 211). =Horse Worm= (_Ascaris megalocephala_). Male six to eight, female twelve to seventeen inches long; sometimes occurs in great balls, causing stoppage. =Round Worm of Cat= (_Ascaris mystax_). Male two to two and two-fifths, female four and four-fifths to five and one-fifth inches long; in the intestines of the cat. _Ascaris marginata_ infests the dog. =Pinworm= (_Oxyuris curvula_). Male one-fourth to one-third, female one and four-fifths of an inch long. In the rectum of the horse, causing persistent itching. Family: =Anguillulidæ= (_Eelworms_).