INTRODUCTIOK xliii 



The plan of the Museum of Practical Geology, on the opposite page, is 

 borrowed, with some alterations, from that published in Mr. Hunt's Descrip- 

 tive Guide. It will be of use by indicating the position and numbers of 

 the Cases referred to in the Glossary. The Wall-cases which contain the 

 collections of British and Foreign ores and metallic minerals, are those 

 situated at the outer margin of the Plan, and the Horse-shoe Case is that 

 surrounding the central area, which forms the glass roof of the Lecture 

 Room. 



The following is a general list of the contents of the various compart- 

 ments into which the Horse-shoe Case is divided, commencing at the south- 

 east end. 



a. Carbon (and its natural compounds) : — Diamond, Graphite. 



h. „ Coal, Coke, Bitumen, Lignite, Mellite, Amber, Ozocerite, Hatchettine, ^c. 



c. Sulphur, and its compounds. 



d. Haloids and Salts . — Common or Rock Salt, Boracic acid, Alum, Cryolite, Nitrate 



of potash. 



e. „ „ Barytes, Strontia, Witherite. 



f. „ „ Gypsum, Selenite, Apatite, Vivianite, S^c. 



g. „ „ Fluor. 



h. „ „ Calc Spar. 



i. „ „ Calc Spar, 3Iarhle, Stalagmite, or Oriental Alabaster, Ara- 



gonite. Dolomite, Fire Marble, ^c. 



j. Earths : — Rock Crystal (and its varieties) : — Amethyst, Cairngorm, False Topaz, 

 Citrine, 3Iorion, Rose Quartz, Ferruginous Quartz, Aventurine, Cafs- 

 Eye, Chrysoprase, Sfc. 



k. „ Amorphous Silica — Quartz, Chalcedony, Carnelian, 3focha-stone, 



Agate, Sard, Sardonyx, Onyx, Jasper, Heliotrope or JBloodstone. 



I. ^„ Amorphous Silica — Flint, Sandstone, Silicified Wood, ^c. 



Hydrous Silica — Opal, Hyalite, &^c. 



m. Alumina, "\ Ruby, Sapphire, Schorl, Tourmaline, Emerald, Clirysoberyl, Cymo- 

 Aluminates, (_ phane, Zircon (^Jacinth, Hyacinth), Sec 



and r Garnets (^Almandine, Cinnamon stone, Romanzowite, Uwarowite^ 



Silicates. J Grossular, Dimanthoid), ^c. 



Jdocrase, Topaz, Pycnite, Chrysolite or Peridot, Chondrodite, Spinel. 



n. Aluminates") Felspar (Adularia, Orthoclase, Labradorite), Lapis Lazuli, Mica, 

 and >• Lepidolite, Gilbertite, Haxiyne, Jade, Leucite, Rhodonite, Antho- 



SlLiCATES. J phyllite, Augite, Epidote, Hornblende, Chlorite, Tremolite, §'c. 



0. Hydrous } Serpentine, Steatite, Diallage, Wehsterite, Cimolite, Bole, Turquois, 



Silicates, j Asbestos, Amianthus, Frelinite, Chabazite, ^c. 



p. Hydrous ") Harmotome, Poonahlite, Heulandite, ApophylUte, Phacolite, Thom- 

 SiLiCATES > sonite, Cluthalite, Analcime, Pectolite, Stilblte, Talc, Meers- 

 (continued). J chaum, ^e. 



The British Ores are contained in the Wall-cases numbered 1 to 14, 24 to 36, and 43 

 to 56 ; the Colonial Minerals in Wall-cases 37 to 42, and the Foreign Ores in Wall-cases 

 15 to 23. 



The remaining numbers in the square compartments indicate the positions of Table- 

 Gases, Models, and other objects. 



