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1 Laboratory of Applied Physiolog, Yale University
(1) Contrary to the usually accepted theory, the occurrence of methemoglobin after administration of acetanilid is not due to p-aminophenol.
(2) Concentrations of p-aminophenol at or above 1 mg. per cent are required to produce methemoglobin in human blood in vitro.
(3) No free p-aminophenol was found in the blood after administration of acetanilid although methemoglobin was found.
(4) Free p-aminophenol was found in the blood after administration of the substance but no methemoglobin was found.
(5) Conjugated p-aminophenol does not in vivo or in vitro produce methemoglobin.
Submitted on March 25, 1947