Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . formalways being placed between the neck and the next older link. Thus the oldersegments are always separated more and more from the head by each newlyformed proglottid, each as it grows older and recedes further from the neckdeveloping in size; the length of the strobile being thus dependent upon the twofactors, growth of the individual length and the new formation of new segments as they are first formed are usually very short and pro-portionately broader, but as they
Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . formalways being placed between the neck and the next older link. Thus the oldersegments are always separated more and more from the head by each newlyformed proglottid, each as it grows older and recedes further from the neckdeveloping in size; the length of the strobile being thus dependent upon the twofactors, growth of the individual length and the new formation of new segments as they are first formed are usually very short and pro-portionately broader, but as they increase in size with age they generally enlargeespecially in their long diameter, and come to be more or less square. Thenumber of these links may vary from three or four to several thousands, thelength of some worms being 100 or more feet. The structure of each link andhence of the whole strobile includes an interior or matrix of an indeterminate ^ Jovir. Am. Med. Assn., 1911, LVII, 1814. See, also, Hinkelmann (New York Med. Jour.,^9iS> CI, 200), who finds these parasites present in water Fig. 29.—Balantidium coli:a, Nucleus; b, vacuoles;c, cytostome, with pit andperistome; d, ingestedmaterial. {Tyson afterLeuckart.) I40 DIAGNOSTIC METHODS. connective reticular material, from which the various organs appear to developand in which they are imbedded; over which are to be recognized exteriorly adelicate cuticle and beneath the latter, two layers of so-called muscle, the outerlayer longitudinal and the inner transverse and circular. ^ Aside from the common parts the various links may be looked upon asindividuals. There is no digestive canal, all nutrition being obtained by theparasite from absorption of dissolved material from the fluids in the infestedintestine. The only really highly organized parts are the generative organs,each link containing both male and female organs. The terminal links arethe ones containing the most ova, while the links nearest the head
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