Practically all the religious denominations have shown more or less concern in the spiritual welfare of the deaf, so far as individuals have been affected, and many churches have deaf members on their rolls. Some of the church bodies have, in addition, given more particular attention to the deaf, and have instituted special activities to embrace as many of them as possible. Such movements have their greatest opportunities in the cities, where it is easier to reach the deaf than in the scattered districts of the country, though some efforts have been made there too. On the whole, however, only a small part of the religious duty towards the deaf is found to have been done; and it remains beyond question that they have been neglected in this regard far too much, and that there is indeed a field "white unto the harvest" for the spiritual well-being of the deaf. Perhaps also there is no sphere of religious endeavor where the need of mutual understanding and co-operation is so manifest as with the deaf. The denominations that have taken special action usually maintain what are called "missions to the deaf," and have clergymen, both deaf and hearing, who give part or all of their time to the work. In a few of the larger cities, as we have seen, special churches for the deaf have been organized, supported with the aid of the denominational body, while in other cases the use of the church building is allowed to the deaf at certain times. Visits are also made from time to time to smaller places when a number of deaf people may be assembled together, and special meetings are arranged for them.[151] In such missions, while the aims are largely spiritual, there are often in addition operations of a material character, with appropriate attention to individual cases of need.[152]