The important rôle played by bacteriology and hygiene in the successful exploration, development and colonization of the tropic countries is a subject sometimes neglected in the literature from these regions. Side by side with the bold navigator, the intrepid explorer, and the persistent engineer, the sanitarian has worked to rescue the riches of the unknown tropics for the overcrowded and overworked inhabitants of civilization.
Reviewing the subject of colonization from its earliest times, we are struck with the comparative ease and freedom from danger with which the emigrant of today accustoms himself to his new surroundings. Before the dawn of scientific medicine the frightful mortality among the early colonists forbade all but those of the most reckless natures to leave their homes to face what seemed almost certain death. The substantial, purposeful emigrant, the true backbone of a successful colony, turned from the tropics to less profitable but more salubrious