. Pathogenic micro-organisms, including bacteria and Protozoa; a practical manual for students, physicians and health officers. ed in pairs: one anteriorly, two laterally,and one posteriorly. The nucleus is situated anteriorly and has acentral constriction. The protoplasm of the body is thick and hya-line. Contractile vacuoles have not been seen. Schaudinn hasrecently observed encystment, copulation, and complicated nuclearchanges in this organism. Infection follows the ingestion of the cysts with unclean parasites fasten themselves to the free surfaces of the epithelialcells by their
. Pathogenic micro-organisms, including bacteria and Protozoa; a practical manual for students, physicians and health officers. ed in pairs: one anteriorly, two laterally,and one posteriorly. The nucleus is situated anteriorly and has acentral constriction. The protoplasm of the body is thick and hya-line. Contractile vacuoles have not been seen. Schaudinn hasrecently observed encystment, copulation, and complicated nuclearchanges in this organism. Infection follows the ingestion of the cysts with unclean parasites fasten themselves to the free surfaces of the epithelialcells by their sucking apparatus, but seem to exert no harmful influ-ence on their hosts. They have been found most frequently in poorchildren who play often in dirt containing the cysts. Repeatedsmall doses of calomel will cause their disappearance from the faeces. CILIATA. The Ciliata (Fig. 185) belong to the most complex of the pro-tozoa. They possess a definite entoplasm containing nuclei and foodvacuoles, and a- definite ectoplasm containing basal granules fromwhich arise the cilia which give the group its name. They have Fig. 185.
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