INDEX. 
199 
Tolfa 1 
Torre Annunziata 120 
Torre del Greco 118, 120 
Toscanella . 86, 87 
Trachyandesite 57, 66 
Trachydolerite, analysis of 75 
Trachyte : 
Analysis of 20, 23, 28, 75, 147 
Description of 19, 22, 27, 74 
Trebianello 110 
Trevignano 132, 140 
Tuoro 84 
Tuscan Region 1, 2, 3, 145, 158, 162, 170 
Tusculum 140 
Type, definition of 12 
Types : 
Correlation of 141 
Descriptions of 9, 12 
Progression of 169 
Succession of 176 
Table of 14, 147 
Valentino 125 
Venanzite 159 
Venetian Region 1 
Vesbal braccianose : 
Analysis of 104, 147 
Description of 103, 106 
Vesbian Volcano. See Vesuvius. 
Vesuvius 8, 104, 105, 107, 116, 118, 120, 159, 165 
Vesuvose : 
Analysis of 122 
Description of 121 
Error in regard to name 104, 123 
Occurrence of 122, 161, 163, 164, 165 
Vesuvose-braccianose : 
Analysis of 118, 147 
Description of 117, 120 
Vetralla 59, 61 
Vicarello 49 
Vicoite 95 
Vicose : 
Analysis of 92, 97, 101, 147 
Description of 91, 95, 96, 99, 100, 102 
Occurrence of 94, 99, 102, 161, 163, 165 
Vicose-ciminose : 
Analysis of 72, 147 
Description of 71, 73 
Vico Volcano.... 5, 22, 23, 25, 26, 36, 39, 41, 
61, 73, 78, 81, 92, 94, 157, 162, 163 
Viterbal vulsinose : 
Analysis of 36, 147 
Description of 34 
Viterbite 40 
Viterbo 24, 40, 56, 57, 73 
Viterboid habit 35 
Vulsinian District. .. 1, 3, 31, 33, 45, 61, 67, 
70, 86, 94, 99, 101, 102, 110, 114, 122, 124, 
125, 128, 131, 132, 137, 140, 161, 166, 167 
Vulsinite : 
Analysis of 31, 59, 75, 147 
Description of 30, 58, 74 
Vulsinose: 
Analysis of 31, 36, 147 
Description of 30, 34, 40 
Occurrence of 33, 39, 41, 161, 162, 163, 165 
Vulsinose-ciminose : 
Analysis of 59, 147 
Description of 58, 62 
Occurrence of 61 
Vulsinose-pulaskose, analysis of 43, 147 
Zale. 
21 
