JAMA. 1903;XLI(9):560-561. doi:10.1001/jama.1903.02490280030006.
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Now that the study of the pathogenic protozoa has become the order of the day, it is reassuring to find that observers trained along zoologic lines are directing more and more attention to the study of these microörganisms. An interesting example of the progress that can be hoped for from studies of this character appears in the recent work of Schaudinn1 on the life history of certain ameboid organisms. Schaudinn calls attention to the fact that the group of so-called amebæ is by no means zoologically well-defined, and that it doubtless contains organisms of most heterogeneous character with widely diverse life histories and uncertain zoologic affinities. In the course of studies that have extended over a period of eight years on the parasitic rhizopods of the human alimentary tract, Schaudinn has made the important discovery that the ameba present in healthy individuals possesses a developmental history radically different from


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