Thus, then, it seems that the first and most important purpose for which great "museums" exist is that of "the making of new knowledge"--the increase of science--by furnishing carefully gathered and preserved "specimens" of all kinds, and by working out the history and significance of those collections. But there is a second and distinct purpose which is often ignorantly put in the first place. It is of less importance and quite unlike the first in the methods necessary for its attainment, and yet is conveniently and satisfactorily carried out in conjunction with the first. This second and distinct purpose is the exhibition of such portions of the collections in a museum as are suitable for exhibition (only a smaller portion are so) in public galleries, so chosen, arranged, lighted and labelled as to afford to the public at large the maximum of enjoyment and edification. This is, as it were, a readily accessible enjoyment given to the public in recognition of the large sums of public money expended on the severer and less easily appreciated enterprise of the museum. The public galleries of a museum, whether of natural history, antiquities or art, should not contain the bulk of the collection, but only special things, carefully selected, and equally carefully placed in case or on wall, with artistic judgment as to space-bordering and colour of background, and with scientific perfection of illumination, so as to produce the "just" impression on the leisurely visitor. The public "exhibit" should be arranged so as to draw attention to a series of important facts of structure or quality clearly shown by the specimens, whether they are natural products or works of art, and these facts should be described in printed labels fully, and the reason for attaching importance to them explained at sufficient length. The man who arranges the public galleries (as distinct from the closed study-rooms) of a public museum, should have a special gift of exposition in plain language, and be able to separate (both in regard to his words and to the specimens he selects) the essential from the non-essential, the significant from the redundant.