In this design also the interior was arranged as one uninterrupted space, about 1,940 feet long, and 408 wide, the roof in one span rising about 120 feet above the floor; the supports, consisting of semicircular ribs, forming the interior into three avenues, the centre one 200 feet wide and the full height, the side ones 104 feet wide and about sixty feet high. In the centre of the length a transept was proposed, and the square area at the meeting of that with the central avenue was to be covered with a glass dome. The ends of the building, as well as those of the transept, were to be filled in with tracery in the upper part, a colonnade below protecting the entrances. Galleries, if necessary, were to be placed in the side avenues. The construction of this building was proposed to be principally of wrought iron, which would have given to the circular ribs and other parts a great lightness of effect; but, on the other hand, the difficulties of producing and putting together such an enormous amount of wrought-iron work in so short a space of time as that required was considered an almost insuperable objection to the design. Large portions of the roof were to be covered with glass, so as to admit an abundance of light into the interior. The accompanying views of the exterior and interior of this design, from the simplicity of the arrangement, consisting of a repetition of similar parts, require but little description for their elucidation. [Illustration: Messrs. R and T. Turner's Design. View of Exterior from one end.] [Illustration: Messrs. R. and T. Turner's Design. Transverse Section, and View of the Interior.] MEMORANDUM ON THE SITE. _Return to an Order of the Honourable the House of Commons, dated 1st July, 1850; for_ COPY of a LETTER addressed by the Commissioners of the EXHIBITION of 1851 to the Lords of the Treasury, inclosing Memorandum as to the Site of the Exhibition Building in Hyde Park. ---- SIR,--I am directed by her Majesty's Commissioners for the Exhibition of 1851 to transmit to you herewith, for the information of the Lords Commissioners of her Majesty's Treasury, a memorandum of the grounds on which the present site has been selected for the Exhibition, and of the proceedings that have been taken in consequence of that selection.--I have, &c. The Right Honourable W. G. Hayter, M.P., &c. &c. &c. ---- Memorandum of the grounds on which the site has been selected for the Exhibition of 1851, and of the proceedings which have been taken in consequence of that selection, prepared for the information of the Lords of the Treasury by the Royal Commissioners for promoting the Exhibition.