13 



1st. Section. — (Table 4.) — Always scratched by apatite, often 

 scratched by fluor, sometimes scratched by calc. spar, never 

 scratched by gypsum. 



'2d. Section. — (Table 5.) — Always scratched by fluor, often 

 scratched by calc. spar, sometimes scratched by gypsum, rarely 

 scratched by talc. 



Zd. Section. — (Table 6.) — Always scratched by calc. spar, of- 

 ten scratched by gypsum, sometimes scratched by talc. 



Second Division. — Exhale no arsenical odor before the blow- 

 pipe. — (Tables from 7 to 14.) 



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

 fect metallic.) 



1st. Section. — (Table 7.) — Always scratched by quartz, often 

 scratched by felspar, sometimes scratched by apatite, never 

 scratched by fluor. 



^d. Section. — (Table 8.) — Always scratched by felspar, often 

 scratched by apatite, sometimes scratched by fluor, never scratch- 

 ed by calc. spar. 



3d. Section. — (Tables 9 and 10.) — Always scratched by felspar, 

 often scratched by calc. spar, sometimes scratched by gypsum, 

 rarely scratched by talc, one instance of semi-fluid softness. 



1st. Sub-section. — Exhale an odor like putrid horse-radish, be- 

 fore the blow-pipe. 



Id. Sub-section. — Exhale no odor like putrid horse-radish, be- 

 fore the blow-pipe. 



4th. Section. — (Tables 1 1 and 1 2.) — Always scratched by calc. 

 spar, often scratched by gypsum, sometimes scratched by talc, 

 one instance of fluid softness. 



1st. Sub-division. — Sp. gr. never below 6.5. 



2d. Sub-division. — Sp. gr. never above 7.2. 



Second Sub-division. — Lustre not metallic, (including semi or 

 imperfect metallic.) 



1st. Section. — (Table 13.) 



2(?. Section. — (Table 14.) — Always scratched by apatite, often 

 scratched by gypsum. 



SECOND GRAND DIVISION. 



First Division. — Lustre metallic, (including semi or imperfect 

 metaUic, (Tables from 15 to 20.) 



