Whilst we have been building our churches and solacing ourselves with our religion and dreaming that the millennium was coming, the poor have been growing poorer, the wretched more miserable, and the immoral more corrupt; the gulf has been daily widening which separates the lowest classes of the community from our churches and chapels, and from all decency and civilization. It is easy to bring an array of facts which seem to point to the opposite conclusion--to speak of the noble army of men and women who penetrate the vilest haunts, carrying with them the blessings of the gospel; of the encouraging reports published by Missions, Reformatories, Refuges, Temperance Societies; of Theatre Services, Midnight Meetings and Special Missions. But what does it all amount to? We are simply living in a fool's paradise if we suppose that all these agencies combined are doing a thousandth part of what needs to be done, a hundredth part of what _could_ be done by the Church of Christ. We must face the facts; and these compel the conviction that THIS TERRIBLE FLOOD OF SIN AND MISERY IS GAINING UPON US. It is rising every day. This statement is made as the result of a long, patient and sober inquiry, undertaken for the purpose of discovering the actual state of the case and the remedial action most likely to be effective. Convinced that it is high time some combined and organized effort was made by all denominations of Christians, though not for denominational purposes, the London Congregational Union have determined to open in several of the lowest and most needy districts of the metropolis, suitable Mission Halls, as a base of operations for evangelistic work. They have accordingly made this diligent search, and some of the results are set forth in the following pages, in the hope that all who have the power may be stimulated to help the Union in the great and difficult enterprise which they have undertaken.