The great principle to be borne in mind is, that, whatever the future destination of the building, it must be self-supporting. The best and most certain test of its utility to the public is furnished by the fact of their being willing to pay for the enjoyments it affords them. The plan of having a considerable portion of the building devoted to a winter garden would supply a great want in our wet and uncertain climate. The temperature ought not to be high, so that exercise might be taken under shelter. No dogs, horses, or carriages ought to be admitted. A large portion of those residing in the immediate neighbourhood would subscribe, and also many who possessed carriages. But the number of subscribers would depend chiefly on the position chosen for the building. In its _present_ locality, the prejudices of the wealthier class would be increased by the injustice of retaining it in violation of the strongest pledges, and it would probably have a very limited number of subscribers. Perhaps it might be desirable to add reading-rooms for newspapers and for the periodical literature of the day. Subscriptions to these might be either for limited periods, or even for a single day. A refreshment-room, also, would be required. If, however, the building were removed to the situation proposed in the seventh chapter of this volume, it would be accessible to a much larger number of subscribers. Its two ends being then placed at a small distance from the two great thoroughfares passing Hyde Park Corner and the Marble Arch, a large number of its visitors would arrive by the omnibuses which pass each of those well-frequented localities. Space might readily be found either for periodical or permanent galleries of painting and of sculpture. An objection has been made to the former, namely, that the light in the glass palace is not fit for the exhibition of paintings. It is singular that it should not have occurred to such objectors that this is almost the only building in which, from its very nature, there exists the most unlimited control over both the quantity and the direction of light that may be required. The profit to be derived from this part of the establishment will, as in the former questions, depend greatly on the situation of the building.