But, sir, acute diseases, and those frequently of the most destructive character, prevail at all seasons among the tenant-house population, and generally with fearful fatality. Although the last summer and autumn were unusually healthy, these records show the prevalence of a vast amount of diseases among the poor of New York. These diseases are of a kind that always originate in or are aggravated by the crowding of families in unventilated apartments, want of sunlight and pure air, house and street filth, etc. First Ward: The diseases prevalent in this district the past season have been principally typhus, measles, diarrhoea, dysentery, cholera morbus, cholera infantum, and marasmus. Diarrhoeal diseases are most prevalent in those insalubrious quarters already described, and at a season when the exciting causes are at their greatest stage of development and activity. Second and Third Wards: Typhus fever made its appearance in tenant-houses, and in two or three instances spread through all the families immediately exposed. At one place the disease attacked successively every member of the family immediately exposed, but was prevented from spreading further by free ventilation. Fifth Ward: The slips, in consequence of receiving the sewerage of the district and surrounding parts of the city, are generally foul and the undoubted source of much sickness. Smallpox has prevailed more extensively than for many years back. Typhus and typhoid fevers have been prevalent over the whole district. Eighth Ward: The prevailing diseases of the past season have been fevers of the typhus, typhoid, remittent and intermittent types, cholera infantum, scarlatina, dysentery, and diarrhoea, all confined to densely populated tenements. The typhus and typhoid fevers have been of a malignant type in two houses, twelve out of eighteen cases proving fatal. Ninth Ward: The prevailing diseases during the past season have been typhoid fever, dysentery, diarrhoea, scarlet fever, measles, and a few cases of variola. [Sidenote: Seeds of Disease Uncontrolled] Sixth Ward: The seeds of disease exist everywhere, and although removable and susceptible of sanitary control, they are yet uncontrolled, and at any time may spring into activity and a terrific life, that shall only have the power and effect of death. Cholera, when it visits these shores again, will first break forth here, if proper sanitary measures be neglected. Typhus fever nests exist in all parts of the district; and it has been traced from these nests to every ward in the city, spreading the disease not only in the worst localities, but into the homes of the industrious, the wealthy, and the highest classes of society. This disease is now on the increase, and if proper sanitary measures are not adopted to remove the predisposing and the infecting causes, we may again have an epidemic of that scourge.