Abstract
In exps. on chickens, dogs, guinea pigs and cats: The structure of blood monocytes and their mode of association depended, in a large measure, on certain qualities of blood serum. Monocytes from different sources tended to take on the same appearance in a given serum. Each serum imposed on monocytes a definite character. Pathological monocytes became like normal monocytes in the serum of the latter, and normal monocytes assumed the aspect of pathological leucocytes when cultivated in the pathological serum. The aspect of monocytes cultivated in a given serum expressed simultaneously the individual characteristics of this serum and the modifications of those characteristics under the influence of pathological agencies.

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