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514 Wenyon, and Walker, the distinctive features of the two species (see also Figs. 78, 79):

While many observers, partly as the result of their own work, but principally it would appear in deference to Schaudinn's great authority, have accepted in the main these descriptions, there are others, notably Musgrave and Clegg, who declare, after careful work extending over several years and carried on in exceptionally favourable circumstances, that they fail to confirm Schaudinn's statements.

In the course of their work Musgrave and Clegg made many important discoveries having a bearing, not only on the etiology but also on the prophylaxis of this type of dysentery They claim to have shown that under certain conditions what apparently were non-pathogenic amœbas, collected from a