( xxvi ) Page Ferruginous Argillite — 385 Argillite, vvith an Excefs of Argill ib. Siiiceous Genus. Iron Shot Quartz — 386 Earthy Quartz — g87 Earthy Quartz, penetrated with yellowifli green A&inolite 388 Earthy Hornftone — 389 Ferruginous Hornftone — 390 Siiiceous Shiftus, penetrated with Argillite 391 penetrated with Müllen ib. penetrated with Limeftone 392 Pitchftone, penetrated with Opal ib. Granite, penetrated with Argillite ib. First Appendix. Diamond 393 Second Appendix. Of Stenes and Earths that owe their Origin to Fire —. 394 Of Volcanos in general — ib. Of Velcanic Productions 400 Of Lavas in general — ib. Of Vitreous Lavas — ib. OfEnamels — 401 Of Volcanic Scorias — 402 Of Volcanic Slaggs 403 Of Cellular Lava — ib. Öf Compadt Lava — 404 Of Volcanic Alhes — 410 Of Pouzzolana ■— 411 Trafs or Terras — 413 Tufas —- 414 Piperino