xxii 
TRANSACTIONS OF THE PLYMOUTH INSTITUTION. 
Quartz Diorite, Vosges; Lamprophyre, Campton (U.S.A.); 
Granophyre, Vosges ; Felsophyre, Erzegebirge ; Pallasite, Rhode 
Island ; Lherzolite, Pyrenees ; Olivine Rock, North Carolina ; 
Olivine-Bronzite Rock, North Carolina ; Dunite, North Carolina ; 
Peridotite, Kentucky ; Picrite, Schriesheim ; Scyelite, Caithness ; 
Kinzigite, Hesse ; Eklogite, Silberbad. 
"Lava; ditto Leucitic ; Obsidian, Ascension, Yellowstone; 
Pumice, Milo ; Pitchstone, Arran ; Tachylyte, Tasmania ; Basalt — ■ 
Curacoa (2), Siebengebirge ; Trachyte, Drachenfels (2), Siebenge- 
birge; Perlite, Kremnitz; Amygdaloiclal Lava, Keswick; Rhyolite 
— Siebengebirge, Arran ; Rhyolite Tuff, Colorado ; Melaphyre, 
Ilmenau ; Liparite, Schemnitz ; Dacite, Belabanyon ; Dolerite — 
Lowenburg, Salisbury Crag; Diabase — Nahe, Niederschield ; 
Olivine Diabase, Maine ; Variolite ; Kersantite, Erzegebirge ; 
Porphyrite, North Berwick Law ; Propylite, Kremnitz ; Phonolite 
— Eifel, Wolf Rock ; Gabbro ; Diallage Rock, Belhelvie ; Hyper- 
sthene Rock ; Andesite, Curacoa ; Hypersthene Andesite, Mount 
Shasta ; Hornblende Andesite, Mount Shasta, Siebengebirge (2). 
" Gneiss, Eddy stone ; Archaean Gneiss, Channel ; Augen Gneiss, 
Saxony; Hornblende Schist — Lizard, Bay of Nigg; Wavellite 
Schist, North Devon; Mica Schist, Shaugh ; Talc-Mica Schist, 
Lizard ; Schorl Schist, Seas water ; Hornblende-Talc-Felspar Rock, 
Lizard ; Schorl Rock, Dartmoor ; Elvan, Cann Quarry ; Minette, 
Bally gowan; Cornstone, Saxe; Norite — Hartz, Keeseville (U.S.A.); 
Halleflinta, Norway ; Serpentine, Lizard ; Hornfels, Hartz ; Lydian 
Stone, North Wales ; Glacial pebble, North Wales ; Siliceous 
Sinter, Iceland; Calc Tufa, Jenny cliff; Travertine, Tivoli ; 
Potstone, Polyphant ; Quartzite — Gerrans, Budleigh Salterton ; 
Siliceous Rock, Newton (near) ; Vitrified Killas, Hingston ; Anthra- 
cite, Bideford ; Lignite, Bovey Tracey ; Retinasphalt, Bovey 
Tracey ; Garnet Rock, Perran ; Lode rocks (3) ; Gossan, Shaugh ; 
Chlorite Rock, Virtuous Lady ; Slate Breccia, Torbay ; Bone 
Breccia, Plymouth ; Porcellanite in Lava, Totnes. 
' ' Rock-forming minerals. — Silica as Quartz, Flint, Calcedony, 
Chert ; Mica, Felspar, Schorl, Hornblende, Actinolite, Tremolite, 
Asbestos, Talc, Augite, Calcite, Dolomite, Apatite, Barytes, Gypsum, 
Fluor, Chlorite, Epidote, Axinite, Pyrites, Hematite, Magnetite. 
"Raised Beaches— Hoe 1839, 1884; Tor Bay, Barnstaple Bay. 
" II. Local Groups. 
"Rocks of Plymouth Sound, East and West — Slates, Grits, 
