This gives, therefore, one hundred and sixty thousand seven hundred and twenty pounds for buildings, which, added to sixty-five thousand pounds for ground, would amount to two hundred and twenty-five thousand seven hundred and twenty pounds. A further sum must be added for alterations of the existing building, particularly for the removal and reconstruction of the staircase, and the formation of the two rooms described as III (69) and XIII (15). Assuming the expense of these alterations, quite conjecturally, at ten thousand pounds, the total cost would be two hundred and thirty-five thousand seven hundred and twenty pounds. The largeness of the valuation allowed for the ground gives reason to believe that the actual expense of ground and buildings would not exceed, and might probably fall short of, this estimate. [Sidenote: MEANS OF FUTURE EXTENSION.] [In concluding his remarks on this plan of reconstruction, Mr. OLDFIELD points out that if ever hereafter further extensions should be required, they might be obtained without material disturbance of the proposed galleries. [Sidenote: _Appendix to Minutes of Evidence_, 1860, pp. 245, _ad fin_.] For Antiquities, one or more additional houses might be purchased either in Bedford Square, commencing with No. 4, or in Charlotte Street, commencing with No. 3. The former would be required for the prolongation of the Greek, Græco-Roman, or Roman Galleries; the latter for the Etruscan or Phœnician. For the minor collections on the upper floors either side would be equally appropriate. If further space were needed for Natural History, galleries might be built as suggested by Professor MASKELYNE, extending either northwards to Montague Place, or eastwards to Montague Street, as found convenient.] To the clear and forcible exposition of his plan, thus given by its framer in the paper submitted to the Committee of 1860, many further elucidations were added in evidence. But enough has already been quoted for the perfect intelligibility of the plans so proposed for the sanction of the Trustees and of Parliament. [Sidenote: _Minutes of Evidence_, June, 1860, Q. 2034, p. 143.] ‘I think,’ said Mr. OLDFIELD, when questioned, in the Committee, as to the extent of provision _for the probable future_ requirements of the Museum, ‘the proper mode is to secure so much space as will at least meet those demands which are likely to occur during the construction of the building; and then, above all, to adopt a system of construction which would at any future time admit of an extension, without derangement of that which now exists, and so would obviate the very great expense and inconvenience which has hitherto occurred from alterations and reconstructions.’