File:A practical study of malaria (1909) (14804982363).jpg

Identifier: practicalstudyo00dead (find matches)
Title: A practical study of malaria
Year: 1909 (1900s)
Authors: Deaderick, William Heiskell, 1876-
Subjects: Malaria
Publisher: Philadelphia and London, W. B. Saunders company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ium). Frog (Rana esculenta). H. splendens. Frog (Rana esculenta). H. magna. Frog (Rana esculenta). H. lacertarum. Lizard (Lacerta muralis). About twenty additional but less readily procured species. There are three sharply defined species of parasites of mala-ria, the parasite of tertian malaria, the parasite of quartanmalaria, and the parasite of estivo-autumnal malaria. Thelatter is divided by most observers into three, or at least two,varieties, the tertian and the quotidian, of which latter varietya pigmented form and an unpigmented form are described.The writers opinion is that there are two varieties of theestivo-autumnal parasite, the tertian and the quotidian, andthat the pigmented and the unpigmented quotidians are merelyforms of one variety. ETIOLOGY 3 A number of students of malaria, with Laveran at theirhead, maintaining the unity of the malarial parasites, holdthat the several species are only forms of one species whichmay be mutually transformed. The arguments upon which
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Fig. 45.—Diagram illustrating the cycles of the parasite.— . — . — . — . Schizogonic cycle. Sporogonic cycle. Parthenogenetic cycle. their theory is based are so unsound in the light of our presentknowledge that it is unnecessary to review them. Biology.—The life history of the parasites of malaria issomewhat complicated, inasmuch as man, the mosquito, and 114 THE STUDY OF MALARIA the parasite are involved, and as there are three species ofparasites and each species has three biologic cycles. Thesethree cycles are: 1. The schizogonic, or human cycle, also called the asexualcycle, monogonic cycle, endogenous cycle, cycle of Golgi, ortrophic cycle. 2. The sporogonic or mosquito cycle, also called the sexualcycle, amphigonic cycle, exogenous cycle, or cycle of Ross. 3. The parthenogenetic cycle, or reproduction by unfertilizedmacrogametes; the cycle of chronic malaria, of latency and re-lapses, an immaculate conception yielding saviours to the spe-cies necessary for its salva

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