THE ROMAN COMAGMATIC REGION. 
Norm and mode, relations of 154 
Noselite, disuse of, in norm 15 
Obsidian 27 
Olibano 21 
Orchi 26, 40, 83, 84 
Orciatico 1 
Oriolo 49, 121, 123 
Orvietal auruncose : 
Analysis of 86, 147 
Description of 85, 87 
Orvietal vicose: 
Analysis of 101, 147 
Description of 100, 102 
Orvieto 4, 70, 87, 94, 101, 102, 125, 161 
Osteria del Tavolato 51, 53 
Ouachitite, analysis of 127 
Paglial procenose-pulaskose : 
Analysis of 43, 147 
Description of 41, 46 
Pallanzanal vulsinose, description of 40 
Panza 26 
Peperino 55, 57 
Petrisco 41 
Petrographic province, use of term v 
Phlegrean Fields... 8, 21, 23, 24, 26, 29, 31, 
33, 42, 43, 75, 78, 165 
Phlegrose : 
Analysis of 20, 23, 147 
Description of 19, 22, 27 
Occurrence of 21, 26, 161, 162, 163, 165 
Phonolitic trachyte: 
Analysis of 23, 147 
Description of 22 
Pianura 26 
Pianural phlegrose 26 
Piperno 26 
Pofi 7, 114, 135, 137 
Poggio Cavaliere 74, 75, 76, 78 
Poggio Cotognola 97, 99 
Poggio Muratella 47, 49 
Poggio Tondo 49 
Porano 102 
Por tici 120 
Preta 122 
Proceno 42, 43, 44, 45 
Procenose-pulaskose : 
Analysis of 43, 147 
Description of 41, 46 
Occurrence of 45, 161 
Procida 8 
Progression of types 169 
Pulaskose : 
Analysis of 43, 147 
Description of 41, 46 
Occurrence of 45, 1 61 
Punto di Castiglione 26 
Quartz, rarity of 159 
Radicof ani 88 
Bare earths, occurrence of 42 
Regional progression of types 169 
Rocca di Papa 113, 114 
Rocca Monfina 7, 90 
Roccastrada 1 
Rock types, table of 14 
Romal albanose: 
Analysis of 131, 147 
Description of 27, 29 
Romal Vesuvose : 
Analysis of 122 
Description of 121 
Ronciglione 41 
Rotaral phlegrose : 
Analysis of 28, 147 
Description of 27, 29 
Rotondella 43, 45 
Sabatinal beemerose : 
Analysis of 47, 147 
Description of 46, 49 
Sabatinian District.... 5, 47, 49, 94, 97, 99, 
106, 110, 114, 121, 122, 132, 137, 140, 163, 167 
Saccal albanose : 
Analysis of 135, 147 
Description of 133, 138 
Sacco River 7 
San Francesco 129 
San Giovanni di Bieda 61 
San Lorenzo 132 
San Martino 39, 72, 73 
San Rocco 36, 39 
Santa Maria di Galera 110 
Santa Trinita 94 
Sassi Lanciati 122 
Scalal vesuvose-braccianose : 
Analysis of 118, 147 
Description of 117, 120 
Scanella 21, 26 
Selva del Lamone 4 
Serial chemical characters 148, 150 
Shoshonose : 
Analysis of 88, 147 
Description of 88, 90 
Occurrence of 90, 165 
Sodalite, disuse of, in the norm 15 
Sommal braccianose, description of 107 
Sorianal harzose : 
Analysis of 56, 147 
Description of 54, 58 
Soriano 57, 65 
Succession of types 176 
Tavolatal janeirose-appianose : 
Analysis of 51, 147 
Description of 50, 54 
Tavolatite : 
Analysis of 51, 147 
Description of 50 
Tavolato 51, 53 
Teanal ciminose-auruncose : 
Analysis of 83, 147 
Description of 82, 85 
Teano 26, 83, 84 
Thenardite, use of, in the norm 15 
Ticchiena 134, 135, 137 
