The scarcity of land in the city has led to the construction of numbers of buildings known as "Tenement Houses." These are large edifices, containing many rooms and, often, as many families. They abound chiefly in the Tenth, Eleventh, and Seventeenth Wards. The majority of persons living in these houses are foreigners. "It is not to be inferred, however, that it is poverty only that causes such dense settlement, since a spirit of economy and frugality manifests itself among these people, which forbids too much expenditure for the high rents charged, or for much riding on the railroads." Still, whatever may be the causes which lead persons to herd together in such buildings, the effect is the same in all cases. The neighborhood becomes dirty and unhealthy, and the buildings themselves perfect pest-houses. Some of them are neat and tasteful in their exteriors, others are vile and filthy all over. They are now generally built for this purpose. As pecuniary investments they pay well, the rents sometimes yielding thirty-five per cent. on the investment. The following description will convey a fair idea of them to the reader. One of the houses stands on a lot with a front of fifty feet, and a depth of two hundred and fifty feet. It has an alley running the whole depth on each side of it. These alley-ways are excavated to the depth of the cellars, arched over, and covered with flag stones, in which, at intervals, are open gratings to give light below; the whole length of which space is occupied by water closets, without doors, and under which are open drains communicating with the street sewers. The building is five stories high, and has a flat roof. The only ventilation is by a window, which opens against a dead wall eight feet distant, and to which rises the vapor from the vault below. There is water on each floor, and gas pipes are laid through the building, so that those who desire it can use gas. The building contains one hundred and twenty-six families, or about seven hundred inhabitants. Each family has a narrow sitting-room, which is used also for working and eating, and a closet called a bed room. But few of the rooms are properly ventilated. The sun never shines in at the windows, and if the sky is overcast the rooms are so dark as to need artificial light. The whole house is dirty, and is filled with the mingled odors from the cooking-stoves and the sinks. In the winter the rooms are kept too close by the stoves, and in the summer the natural heat is made tenfold greater by the fires for cooking and washing. Pass these houses on a hot night, and you will see the streets in front of them filled with the occupants, and every window choked up with human heads, all panting and praying for relief and fresh air. Sometimes the families living in the close rooms we have described, take "boarders," who pay a part of the expenses of the "establishment." Formerly the occupants of these buildings emptied their filth and refuse matter into the public