Ixxxviii Historical Sketch of the Physical Sciences, 1818. 
B. Earthy (continued). 
‘Garnet, Epidote, 
Essonite, Stlbite, 
Idocrase, Analcime, ¥ 
Felspar, Nepheline, 
Apophyllite, Disthene or cyanite, 
Actinolite and tremolite, Mica, 
Diopside, Macle. 
C. Combustible. 
Diamond. 
D. Metallic. 
Carbonate of lead, Carbonate of zinc, 
Sulphate of lead, Oxide of tin. 
Tungstate of lime, 
The following species are placed here merely from analogy: 
Carbonate of magnesia, Scapolite, 
Borax, Diallage, 
Sal-ammoniac, Anthophyllite, 
Alum, Lemonite, 
Cryolite, Sodalite, 
Wavellite, Chabasite, 
Spodumene, Harmotome, 
Petalite, ‘ Pinite, 
Granatite, Dipyre, 
Hyperstene, Asbestos. 
Wernerite, 
Appendix. 
Substances exhibiting resinous or negative electricity joined 
to an unctuous feel. They are capable of insulating when trans- 
parent and colourless. 
Foliated talc, Agalmatalmolite ? 
Granular tale ? 
CLASS II. 
Substances having a peculiar colour depending on their nature, 
capable of insulating in what state soever they are, and acquiring, 
when rubbed, resinous or negative electricity. Anthracite alone 
must be insulated before it can be excited. 
Sulphur, . Retinasphalt, 
Bitumen, Amber, 
a. glutinous, Mellite, 
b. solid, Anthracite. 
c. elastic, 
