6 THE LEWIS BROOKS MUSEUM. 



THE SYSTEMATIC COLLECTION OF MINERALS. 



Iq this collection are placed the different species of 

 minerals, so arranged as to exhibit their relations to each 

 other, as well as their distinguishing characteristics. The 

 cabinet contains about three-fourths of the species recog- 

 nized. The most important are represented, each by seve- 

 ral specimens, including both the crystallized and amor- 

 phous condition of the mineral, and illustrating the varie- 

 ties, if such exist. They are, in the main, from European 

 and American localities, the mining districts of Cornwall, 

 Saxony and Hungary having furnished the choicest masses 

 of ore and the most brilliant crystals. Each specimen is 

 mounted on a handsome .black walnut block, which has a 

 printed label with the name of the mineral and the locality. 

 The detached crystals are mounted on upright brass holders, 

 which have on their pedestal the name of the mineral and 

 the form of the crystal. 



The systematic series is grouped into the following 

 classes, each of which contain numerous species, illustrated 

 by many specimens : 



Class 1. — Carbon and Boron Compounds. — This includes 

 the diamond, the varieties of coal, graphite, &g. 



Class 2. — Sulphur and Selenium. — Contains native sul- 

 phur and sulphur with selenium. 



Class 3. — Haloid Minerals. — This class includes com- 

 mon salt, nitre, polyhalite, borax, strontianite, the many 

 varieties of gypsum and of calcite, with magnesite, dolo- 

 mite, nuorite, the varieties of sapphire, and many other 

 minerals. 



Class 4. — Earthy Minerals. — This includes the nume- 

 ous varieties of quartz, opal, serpentine, pyroxene, horn- 

 blende, the feldspars, tourmaline, &c, and a great number 

 of rare minerals. 



Class 5. — Metals and Metallic Ores. — This class includes 

 a great number of the compounds of tin, titanium, iron, 



