A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . al cells, etc. (Fig. 5165). The digestion of ery-throcytes is accomplished without e.\cretion of anypigment masses. Reproduction in the human intestine by simple divisionand by schizogony, with the format ion normally of eightdaughter cells. In fission the nucleus undergoes ami-totic division, while in schizogony complicated nuclearchanges are seen with the elimination of a portion of thechromatic substance. As a preliminary step to encyst-ment all foreign bodies ar
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . al cells, etc. (Fig. 5165). The digestion of ery-throcytes is accomplished without e.\cretion of anypigment masses. Reproduction in the human intestine by simple divisionand by schizogony, with the format ion normally of eightdaughter cells. In fission the nucleus undergoes ami-totic division, while in schizogony complicated nuclearchanges are seen with the elimination of a portion of thechromatic substance. As a preliminary step to encyst-ment all foreign bodies are from the protoplasm,which thus becomes clear and transiiarent. These cysts,first discovered by Grassi, were carefully studied by Casa-grandi and Barbagallo. They constitute the means oftransmitting infection, as has been determined experi-mentally, first by Calandruecio who swallowed such en-cysted forms and found the developed amabie twelvedajS later in the freces. The normal seat of this speciesis the upper region of the colon, and the vegetative formsappear in the faeces only when the latter are semi fluid by. Fio. 5165.—.iHiaItrt coii, from Dysenteric Intestine, more or lesslllled with Erythrocytes ; Nucleus also visible. Magnified. (FromDofiein after Roeiiier.)* reason of disease or of the administration of cysts which are so characteristic as to be confusedwith nothing in the faeces are capable of further develop-ment only when they contain eight nuclei. Other cystshave been determined experimentally by Sehaudinn tobe incapable of development, even though they actuallyconstitute the major part (eighty per cent.) of thoseevacuated. In old dry faCal matter only the forms witheight nuclei are present, and in the colon of the nexthost eight small amtpb;^ are formed by division of theprotoplasm and emerge to begin a new infection and anew vegetative period. This species occurred in East Prussia in fifty per cent,of the examined; in Berlin t
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