APPENDIX. WEIGHTS PER CUBIC FOOT OF BRITISH BUILDING STONES. [From the ‘ Mineral Statistics of the United Kingdom,’ by Mr. U. Hunt, F.B.S. i860 (Part II).] The following table has been constructed by Mr. C. H. Smith, who, as one of the Commissioners for selecting the stone for the Houses of Parliament, had already, in the Report furnished by them, published many results, which are here reprinted. Upon apply ing to that gentleman for some additional information, he most liberally undertook to construct a new and correct table, showing the weights of a cubic foot of specimens fairly representing all the varieties of building stones used in this country. The various stones named may be considered as fair average samples of the material which each of the quarries respectively produces. In nearly all cases, the density, or avoirdupois weights, have been ascertained with two very accurately squared six- inch cubes (duplicates, equal to one-fourth of a cubic foot), weighed in the state in which stones are usually employed for masonry.