Catalogue of the collections / Comp. by E.M. Holmes.

  • Pharmaceutical Society of Great Britain. Museum
Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: Catalogue of the collections / Comp. by E.M. Holmes. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

    245/320 (page 233)
    In the same case with the glass models will he found tolerably perfect crystals, belonging to the cubical system, of the following sub- stances :— 657. Cube. Iron Pyrites. {Bisulphide of Ivon.y Galena. Iodide of Potassium. Bromide of Potassium. 658. Octahedron. Alum, small octahed'ra. Ditto, a large octahedron.. Chrome alum, ditto. Chrome alum and common alum crystallized together in one octahedron. Note.—These remarkably fine octahedra were prepared and presented by Mr. W. Copney. See P. J.. [1], vol. x.,.p. 536. 659. Dodecahedron. Iron Pyrites. 660. Hollow Pyramids. Chloride of Sodium. Models in wood of the following crystalline forms, also belonging to the cubical system, will be found in the- upper compartment of case No. 9 :— e. Octahedron. /. Rhombic dodecahedron. g. Trapezohedron. h. Tetrahedron. 661. II. Square Prismatic System. (Pyramidal system, 2 and 1 axed system.) a. Glass model (fig. 24), showing the following forms:— White, short octahedron with square base. Yellow, long octahedron with square base. Black lines on the glass, square piism. Note.—In this system tbe two horizontal axes, indicated by red wires, are equal in length, while the vertical one is either longer or shorter than the two horizontal axes; all three axes being at right angles to one another. b. Crystal of Ferrocyanide of Potassium. Note.—This is a short octahedron with a square base; the apex in this specimen is truncated. c. Wooden model of Ferrocyanide of Potassium, c. Wooden model of Mercurous Chloride. Note.—For fig. of this model, see Phillips' Transl. of Pharm., p. 310.