On Sept. 20th, Medical Delegates from all parts of Europe met in the Hall ot the Royal A'cademy of Brussels, in Belgium, to discuss questions relative to the dwellings of the working classes, drains, public baths, laundries, good water, ventilation, infant food, mir-ral intei-ments, bad food, crimina'ity ol the sexes, the regulation of workshops, and all that relates to general health. It is one of the most important conventions that has met since the world began. The discussions were to be conducted with closed doors, but the reports were to be read publicly. We hope that great good may result from this Congress, to the working classes of Europa. We have much need of such a Convention in New York city, for in some parts of it the denizens, most of them from foreign countries—are more thickly crowded than in London. With our warm summer weather, and the extreme cold of winter, overcrowding in houses is more fatal to health than in London.