Yellow fever, a true American disease, originating in the West Indies, is a permanent menace to the United States. So long as unhygienic conditions persist in Cuba, supported by a state of, it seems, permanent revolution and destruction, the southern parts of this land will never enjoy the security so necessary for the development of a general happy state of the population. But it may be asked, Is the terror excited by such invasions and the rigorous quarantine executed in consequence of this feeling of the population really necessary? We have learned in the last years by a more intimate knowledge of the causes and the manner of infection, that the severest diseases lose most of their danger and cease to excite the population. Relying on the possibility of securing himself against the infection, man will no more relinquish his home in blind terror. I might refer to the "Go-not-away-Club"