It is not necessary here to consider the part played by sea-going craft, for this, as a factor in spreading disease, is practically eliminated. The ancient method of detention for a definite period has been superseded by inspection and exclusion of infected persons and things at the port of departure and repeated inspection, with disinfection if needed, at the port of arrival. Neither is it necessary to speak of the modern methods of inland quarantine, in which inspection with cleansing and disinfection have obviated all serious interruption of traffic. In both the measures used are reasonably efficient for the protection of the public, and at the same time generally satisfactory to carriers.
There is, however, a source of danger which so far, has attracted little attention, and no measures have been put in operation to counteract it. This is the disposal of the excretions of travelers on inland waters and