The "Arena" is mentioned here as a type, again. Chicago is infested with such places. They may be found in our best residence districts, near fashionable churches and adjoining homes where purity is sacred. To state more specific facts on such places we will name several more similar "flats." A "Mrs. Clouds" conducts a similar place on La Salle avenue near Erie street. It is necessary to have a letter of introduction or be known before entrance can be effected. Here, nightly, men of wealth and even of prominence with wives and families, ignorant of their orgies, take young girls. The automobiles of the wealthy drive up to this place every evening and their occupants seek their pleasure within. Here many-course dinners with wine as a zest giver--usually champagne--are served to the patrons for $12 a plate. It is the vice haunt of the millionaires and their purchased women. Then there is the place of Mrs. Mohr in Erie street, west of Rush street, where the same luxuries are in evidence, where the same vices are committed and where the range of prices eats deep into anything but a plethoric bank account. These places run without intervention. They are known to few outside the patrons. They pay, as do all other forms of vice, for police toleration. Reform movements have not attacked them because they are scarcely aware of their existence. They are but a small part of the contributing elements of graft and corruption. We have digressed, but it was necessary to show the source and end of a vice evil starting in the big hotels. In these "flats" of secrecy, girls will be furnished in the same manner as they are furnished by "Miss Harris" and her ilk of panderers. But let us resume our trip in the underworld. From the hotels, we move southward again. THE BORDERLAND OF HELL. Down Michigan avenue, Wabash avenue, State street, Fifth avenue and many other prominent thoroughfares leading out of the loop district, are the "assignation hotels" of Chicago. These are the houses where men bring their victims at a cost of one dollar to five dollars a room, where street walkers "steer" their customers and where vice festers with the roar of the business world outside the windows. Within the loop district alone there are fifty hotels of this vicious character. Their average earnings, according to a prominent investigator and reformer, are $600 a night. As we move southward we pass them at every step, little dreaming of the lives that have been ruined within and the tragedies that have begun and culminated there. The part of the South side in which we have entered was at one time a fashionable neighborhood of wealthy and respectable residents. The Vice Trust drove them away by its encroachments. Today those same buildings are tenanted by lost women, living there and carrying on their nefarious trade in the district but a short distance away.