468 



STBENG, diallage 155 



forellenstein 133 



gabbro 132,161 



SULLIVAN, analysis by 304 



Syenite 270, 292, 



Synthesis of rocks 404 



SZABO, determination of felspars... 145 

 garnet and cordierite in tra- 

 chyte 842 



T 



Tachylite 137, 182 



TAIT, M. M., analysis by 347 



TAWNEY, Anglesea rocks 319 



diabase-porphyrite 221 



" greenstones " of North 



Wales 215 



hornblende-picrite 98 



hornblende-porphyrite ... 284 

 olivine- and hornblende- 

 diabase 99 



rocks of St. David's, 



222, 318, 335 

 TEALL, analyses by 157, 209, 200, 265 



augite 157 



Cheviot-andesites 278 



felspar-aggregates as por- 



phyritic elements 141 



felspar of Whin Sill ... 147, 209 



intergrowths of pyroxenes 31 



North-of-England dykes ... 200 



zonal structure in felspars 32 



TELLER AND VON JOHN, norite and 



quartz-norite 255 



Tephrite 360 



Teschenite 95,191,359 



Texture ... 51, 55 



Theralite 359 



THURACK, zircon 168 



TILDEN AND SfiENSTONE on solubility 393 



Titaniferous iron ore 235 



Toadstone 209 



Tonalite 254 



Topaz 305, 316 



TORNEBOHM, Ottfjall diabase ... 242 



zones round olivine ... 165 



Tourmaline 169, 305, 385 



Tourmaline-hornfels 375 



Trachy-dolerite 258 



Trachyte 292 



Trachytic rocks 331 



texture 69 



Troctolite 133, 172 



TRAILL, metamorphosis of basic 



igneous rocks 249 



TRECHMANN, gabbro 178 



Tremolite, of contact rocks 887 



PAGE 



Tridymite 260,801 



TRIPPKE, intergrowths of pyroxenes 81 



Trowlesworthite 294, 316 



TSCHERMAK, classification of rhom- 

 bic pyroxenes 87 



genesis of serpentine... 108 



peridotites 79 



picrite 80 



pseudomorphs after oli- 

 vine 86 



teschenite 859 



U 



Uralite 235 



diabase 148 



Variolite 184 



VELAIN, sphene and iron ores ... 269 



Vesuvianite 390 



Vitreous rocks, specific gravity of 49 



Vitrophyre 292 



VOGELSANG, Arran pitchstones ... 344 



crystallites 18 



Scotch basalts 190 



secondary inclusions ... 27 

 skeleton crystals of 



magnetite 166 



Vogesite 851 



Volcanic rocks, sequence of 67 



specific gravity of 49 



VOLGER, serpentine after olivine . . . 104 



W 



WADSWORTH, classification of rocks 65 



- saxonite 80 



WALLER, analyses by ... 213, 275, 344 



contemporaneous veins ... 211 

 enstatite-diorite 273 



- felsites of Warwickshire... 841 



- felspar of contemporaneous 

 veins 138 



- strain-phenomena in obsi- 

 dian 12 



WARD, contact-metamorphism ... 889 



diorite 99 



felsites of Lake District . 842 



granites of Lake District ... 322 



inclusions .. 26 



minette 857 



Ordovician felsites 336 



porphyrites of Lake District 281 



rocks of Eycott Hill 225 



WATTS, enstatite-diabase 222 



enstatite-porphyrite 284 



WATT GREGORY, synthesis of rocks 403 



