are received, as, in addition to the customary form, it has been required that they should also be sent upon the understanding that the materials shall remain the property of the contractor, and shall in fact only be hired for the purposes of the Exhibition. The third requisite of the building is, that it should be at least seemly, though it may not be necessary that it should be highly ornamental. The Commissioners trust that it will fulfil this condition, while they would at the same time point out that no expense is to be incurred for merely ornamental purposes, unless it should be thought desirable to select a dome for covering in the large space which must necessarily be left in the centre of the building to suit the internal arrangements. A cheaper mode of covering in this space will probably be resorted to, and the Commissioners have directed that a special estimate of the cost of the dome should be laid before them when the tenders are complete, in order that they may judge of the propriety of sanctioning its erection. Having offered this short explanation, they can only repeat once more the assurances they have already given, that the building is not intended to be permanent, and that it will be entirely removed, in accordance with the conditions prescribed by the Lords of the Treasury on yielding up the site, within seven months after the closing of the Exhibition, which cannot be deferred after the 1st of November, and will probably take place at an earlier period in the autumn of next year. 22. Another ground of apprehension is stated to be, lest the Park should be injured by the erection of the building, and the injury should continue after the structure is removed. This apprehension is, however, groundless; a small clump of ten trees has been allowed to be removed, in compensation for which, it is proposed by the Commissioners of Woods and Forests to plant another clump elsewhere. It is not intended to cut down any more than that clump. As regards the surface of the ground to be occupied, it will not only not be injured, but will ultimately be materially improved by being drained and freshly sown with grass seed. It will be a strict condition with the contractors for the building that they shall, on its removal, restore the ground to its present condition. 23. Some dissatisfaction has been expressed at the prospect of a furnace being erected to heat the boiler and drive the steam-apparatus. It is however, intended to construct such furnace on the principle of consuming its own smoke, or to burn coke instead of coal, should that, upon the whole, appear the best mode of preventing annoyance. Care will also be taken not to erect any chimney of an unsightly character.