Students of the history of Protozoology are generally agreed that the earliest recorded observations on the Coccidia are those of Hake (1839). Bütschli (1882, p. 490) mentions his work, though he did not see it; and it has been cited by Leuckart (1879), Labbé (1896), and several other writers on the Sporozoa—including myself (1919)—as the first publication in which coccidia are recognizably described.
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Clifford Dobell (1922) studied this question.
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