It was first demonstrated on a large scale, by what was observed in the “Insane Colony” at Gheel, in Belgium, which, some fifty years ago, began to attract the attention of those engaged in lunacy administration, that a large number of the insane may be suitably provided for in private dwellings. It is now more or less widely recognized that in many cases they can be provided for in this way better than in asylums; and as regards the insane poor that they can often be thus provided for in a way not only conducive to their own welfare, but also at less cost to the public. This fact has received its most complete and systematic recognition in the lunacy administration of Scotland. Practical effect has been given to this recognition in various ways both on the continent of Europe and in America. One of the most recent and important steps in this direction has been taken by the authorities of the great city of Berlin, and it is proposed to give an account of what has been done by the Berlin authorities in the following paper.