Two sheep have been repeatedly injected with an aqueous extract of ragweed-pollen. The sera of these sheep contain an antibody which inhibits the Prausnitz-Küstner reaction to an extract of ragweed-pollen.

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The immunization of the sheep was conducted by and the serum obtained through the coöperation of the Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.

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