The problems of tropical medicine are becoming of more importance each year with both the profession and the public. The world is filling up, population is spreading over the known habitable regions and the call is ever for more territory for civilized man to conquer. Even on this continent the land hunger is no longer appeased except by encroaching on the semi-arid regions of the west or the sub-arctic territories to the north. The improved means of communication have brought all countries nearer together and the tropical regions of the world are thus made our immediate neighbors and common resorts for vacation excursions. Nearly every civilized country, too, has now its tropical dependencies or is seeking for such. Our own country is no exception, the problem comes home to us now and will be of still more importance as the years go by.
The two chief questions are, 1, the