3. The conservation of all specimens not necessary for the purpose defined in Paragraph 1 in a place apart.
4. The accessibility of all objects contained in the museum to the curator and to scientific students, without interference with the public or by the public.
5. Thorough exclusion of dust and dirt from the specimens.
6. A provision of space for workrooms, and, if need be, lecture-rooms.
PRINCIPLE.
A big hall (350 x 40 x 30) with narrower halls on either side, lighted from the top. The central hall for the public, the others for the curators, etc. The walls, of arches upon piers about 15 feet high, bearing on girders a gallery 5 feet wide in the public room, and 3 feet 6 inches in the curators'.
The cases should be larger below, 5 feet deep, and smaller above, 2 feet deep, with glass fronts to the public, and doors on the curators' side.
For very large specimens—e.g. a whale—the case could expand into the curators' part without encroaching on the public part, so as to keep the line of windows regular.
Specimens of the Vertebrata, illustrations of Physical Geography and
Stratigraphical Geology, should be placed below.
The Invertebrata, Botanical and Mineralogical specimens in the galleries.