12 



6. They are found coating or investing other ores, either as a 

 crust or powder. 



synopsis' 



First Grand Division. — Tabular view of metallic minerals 

 which fuse or volatilize entirely in the flameof a blow-pipe, exha- 

 ling visible or odoriferous vapors of arsenic or antimony or sul- 

 phur, or any other peculiar vapors which have been noticed by 

 mineralogical writers. (Tables from 1 to 14.) 



Second Grand Division. — Tabular view of metallic minerals 

 which fuse partially or wholly in the flame of the blow-pipe, with- 

 out developing any volatility either to the sight or smell. (Tables 

 from 15 to 20.) 



Third Grand Division. — Tabular view of metallic minerals 

 which are almost or altogether infusible in the flame of the blow- 

 pipe. (Tables from 21 to 31.) 



Fourth Grand Division. — Tabular view of metallic minerals 

 which impart a styptic metallic flavor to the palate and are solu- 

 ble in water. (Table 32.) 



Appendix. — Tabular view of metallic minerals whose charac- 

 ters are not sufficiently known to admit of confident arrangement 

 in any of the foregoing tables. 



FIRST GRAND DIVISION. 



First Division. — Exhale the arsenical odor, before the blow- 

 pipe. — (Tables from 1 to 6.) 



First Sub-division. — Lustre metallic, (including semi or imper- 

 fect metallic.) 



1st Sectoin. — (Table 1.) — Always scratched by quartz, often 

 scratched by felspar, sometimes scratched by apatite, never 

 scratched by fluor. 



2<Z. Section. — (Table 2.) — Always scratched by felspar, often 

 scratched by apatite, sometimes scratched byfluor never scratched 

 by calc. spar. 



3d. Section. — (Table 3.) — Always scratched by calc. spar. 



Second Sub-division. — Lustre not m'elallic, (including semi or 

 imperfect metallic.) 



