MARITIME COMMERCE IN ITS RELATION TO THE SPREAD OF PLAGUE.
Plague, like cholera, follows in the wake of commerce. For a long time many features connected with the transmission of plague by vessels were not understood. While it was easy to discern the relation existing between a vessel having cases of plague on board and others contracted from these on land, we were often at a loss to discover the origin of outbreaks occurring at seaports which could not be ascribed to vessels or their personnel. The various theories in vogue from time to time were a natural sequence. The careful observations of the past few years have been of greatest value in determining just what part the vessel, cargo and personnel play in the transmission of plague. Is it possible for the personnel of a vessel to bring the infection aboard, either in their persons or in their effects