Abstract
July 18, 1918, a patient was admitted to the base hospital of Camp Johnston in an alarming state of cyanosis. His finger-nails and lips were a deep blue, almost black, yet he complained of no special discomfort. The condition was first noted by friends of the patient, who himself would not have known that he was ill. Examination of the patient was essentially negative, except in the marked cyanosis. The temperature and pulse were normal. Blood taken by puncture of the finger appeared dark. The red and white counts were about normal, but the hemoglobin could not be read on the Tallqvist scale, since it was much above 100. With rest in bed and catharsis, the patient quickly regained his normal color, so that he was well in twenty-four hours. Following this initial case in July, other cases occurred in August, September and October. By the end of October there

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