Source Of Infectious Diseases

Ail of theinfectiousdiseasesundoubtedly possess an original habitat, wliere it is probable they are iiow as always capable of spontaneous origin in their primitive form, whatever ihat muy be. The difiïcnlty of tracing disease-types through various localities and among different peoples of the globe have, up to this time, prevented a precise knowledge upon the point, which time may yet bring ws. It seems tolerably eertaiu, howeyer, that the several acuto infectious dipeases named below have the nativities here attributed to tliem : The Cholera- Has its home in India. The Small-Pox- In the Ea&t. Known in China nearly 1,200 years before Christ. Tho Plague - An Oriental diseaae. Has a distinct geographioal range. The Typhus Fever - Ireland is its birtbplace. The Typhoid and Kelapsing Fevers - Have fixed centers iu Ireland, Giilicia, Upper Silesia and some provinces of Northern Italy. The Military Fever - Is endemic in a few provinces of France, Germany and Italy. Scarlatina- Probably native to Arabia Epidemie Djsentery - Home in the tropics. The Dengue - In Southern latitudes, with sharp geographical limits. The Yellow Fever - Distinctly traced to the Antilles. Tiie Chabalongo- Chili. The Verruga - Peru. Certain it seems that no general influeace of exposure or bad hygienic surroimdings will establish the typical diseaso away from its iocal habitat, except throagb the penalties of hereditv. -