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XXVII] According to Sambon, the explanation lies in the circumstance that the men, in their vocation as fishermen, often have occasion to visit the mainland and to pass the night there, and are consequently exposed to the bites of Simuliidæ and other midges; whereas the women, having no occasion to leave the island, escape infection.

Goldberger, who failed to communicate the disease to any one of 16 men by the administration of the discharges, secretions, and tissues of no fewer than 67 pellagrins, rejecting the idea of a germ cause of