THE Corporation has offered to throw open the Museum of Natural History, the Botanical Garden, the Mineral Cabinets in Boylston, the Fine Arts Collections, and the Agassiz Museum (if the Trustees will permit), for inspection on Sunday afternoons from May 1 to November 1, provided that the city of Cambridge will supply police for the buildings. The authorities hesitate about accepting the offer, it appears. After the great success that has attended the opening of the Boston Museum of Fine Arts on Sunday afternoons, it seems strange that any serious objection should be made here to an attempt to provide innocent amusement and instruction on Sundays, for those who are busy during the rest of the week. The Corporation has made a generous offer, and has shown its willingness to give the public the benefit of its collections. It is thus not unreasonable to hope that, as soon as the finances of the Library will allow it, the reading-room, at least, may be kept open for us on Sundays, even if it is not found practicable to keep open the delivery department.