Multiple precipitin formation may be induced in the rabbit by the successive introduction of different antigens, and many precipitins may exist simultaneously in the blood for some time. Precipitins no longer demonstrable in the blood of a rabbit subjected to multiple successive immunization may reappear on the injection of only one of the antigens previously injected. Whether an unused antigen would have the same effect has not been determined.

protein of these cells themselves, yielding a filtrate from which, as we have found by experiment, oxyhemoglobin more readily crystallizes and in a much purer state than by any other known method.

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