Part 40

—— genera of 266–270

—— calcareous 269

—— cinnabarine 275

—— cupreous 276

—— gypſeous 267

—— inflammable 273

—— irony 277

—— ſiliceous 271

—— ſilvery 274

—— vitriolic 268

—— pſeudo-galena 278

Petroleum 137

—— ſpecies of, 138–141

Petroſilex 129

Phoſphoric acid 34

Pipe clay 113

Pit coal 139

Platina, properties of, 151

—— how made malleable, n. 151

—— ſpecies of, 152

Platinum (ſee platina)

Plumbago 135

Plumbum (ſee lead)

Porcelain clay 113, and n.

Pruſſian blue, native 206

Pſeudogalena 236

Pyrites 204

—— argenteus 164