Differential counts of the leucocytes of tadpoles and frogs, R. catesbeiana, were made 48 hours after the injection of hydrocortisone acetate (experimentals) or distilled water (controls). 2. Neutrophilia and lymphopenia were evident in both the immature and mature experimental animals but not in the controls. 3. These changes in the distribution of white blood cells resemble those known in mammals and in R. pipiens.
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Bennett et al. (1968) studied this question.
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