ETNA.

ETNA, 30, 39, 42, 43 n., 44, 134 n.;
compared with Mont Dore, 115, 116 n.;
great extent of some of its lava-currents,
117 n.; luxuriant growth of its chesnut-
trees, 190.

Agde, 196.

Aidat, lake of, 74, 92, 103.
Aigueperse, 12.

Aiguiller, Puy de l', 126, 131, 137, 138.
Aix, 196.

Alagnon, the, 146, 150, 151.

Alais (Gard), 3, 4.

Alassac (Corrèze), 3."
Alègre, 155, 184.

Alignon, the, 190, 191.

Allier, 2, 4, 7, 15, 17, 20, 26, 40, 112,
134, 135, 139, 146, 154, 155, 176, 177,
184, 211; probable cause of the fall of its
celebrated bridge, 154 n.; extreme vio-
lence of its floods, ib.

Alpes, Hautes, 1.

Alps, the, 186, 212.

Aumône, Cheire de l', 55, 58, 61.

Aurillac, 24, 25, 132, 148, 200; auriferous

origin of its name of, 151 n.
Autun (Saône et Loire), 4.
Auvergnat, 79.

Auvergne, 1, 2, 7, 11, 26 n., 28, 31, 32,
33, 34, 38, 43, 47, 58, 60, 72, 81, 96 n.,
100, 169, 176, 178 n., 181, 198; number
of ruined "châteaux-forts" on its peaks,
and ultimate fate of their lawless pos-
sessors, 102 n.

Auvergne, la Tour d', 139.

Auvergne, Limagne d'. See Limagne.
Auvergne and Forèz, surface elevation at-
tained in the regions of, 1; vestiges of
deposits of freshwater lakes there, 2.
Aveyron, 3, 4, 5, 152.

Aymard, M., 27, 35 n., 178, 218; his
arrangement of the fossils, &c., of the
Haute Loire district, 229-231.

Ayzac, la Coupe d', 186, 193; beauty of its
crater and basaltic columns, 193, 194

Baladon, Puy de, 133.

Bannière, Puy de la, 44, 78, 82, 83.
Banson, Puy de, 87.

Bar, Montagne de, 184; its height, 233.
Baraque, La, 63.

Barbier, Puy de, 133.
Barbu, le Roc, 127.
Barme, Puy de, 88.
Barmet, Puy de, 61.

Barnère, Puy, 211; its composition and
height, 233.

Basalt of Chalucet, composition of the, 98;
preservative agency of the disposition of
basaltic prisms, 106 n.; olivine not in-
variably a characteristic of basalt, 130
n.; question of the alternate superposi-
tion of trachyte and basalt, 131 n.;
favourable occasion for observing the
igneous origin of basalt, 142 and n.;
interesting character of the basaltic

Beaune, Valley of, 89.

Beaumy, Puy et Lac de, 79, 80, 82.
Beauregard, 19.
Beauzac, 157.
Bedarrieux (Herault), 4.
Benoit, Puy, 112.
Bert (Allier), 4.

Berzé, Puy de, 106; its site, 108; its alti-
tude compared with that of adjacent
puys, 109; this puy the probable source
of the basaltic current of Gergovia, 204.
Besace, Puy de, 88.

Besse, Valley of, 134, 143.

Bendant, M., remarks on the views of,
relative to the superposition of trachyte,
131 and 132 notes, 147,

Beurdouze, 144.

Beziers, 196.

Blaves, 178.
Boen, 28.

Boiseghoux, 100.

Bone-beds of Mont Perrier, locality of
the, 135.

Bones. See Human Bones.
Bonnevie, Montagne de, 150.

Borne, the, 175, 177, 181, 183 n.

Bort (Puy de Dôme), 4, 149.

Bouchet, Lake du, 185.

Bouillet, M., 29 n., 35 n., 87 n., 217.
Bourboule, la, 23.

Bourglastic, 4.

Bouttières, les, 167.

Bozat, Plateau de, 132, 133.
Brassac, 4.

Bravard, M., 135, 217.

Breccia, human bones found in, 181, 182.
Breislak, M., 48 n., 120 n., 122 n.
Bridges, natural, formed by incrusting
springs, 22; single-arch bridge over the
Allier, 154 n.

Brion, 144.

Brioude, 7, 154, 182, 211.
Brives (Corrèze), 4.

Brocchi, M., 19 n., 48 n., 120 n.
Brongniart, M., 8, 11.
Brousson, Puy de, 94.
Brunelet, 173,

CAPUCIN.

Buch, M. von, 33, 48, 51, 96 n., 180 n.
Building-stone, quarries of, 78, 128.
Burat, M., 35 n.

Buron, Pic de, 113.

Burzet, volcano of, 186, 187, 192; fre-
quency of olivine nodules in its basaltic
bed, 188; illustration of contractile force
afforded by these nodules, ib. and n.;
idea suggested to the natives by the hori-
zontal sections of basaltic columns, 188,
189; form and dimensions of the
columns, 189.

Butte de Montpensier, 12.

Cacadogne, 125, 126, 133.
Caddis-fly. See Phryganea.
Cæsar. See Julius Cæsar.
Caissière, La, 92.
Calcareo-volcanic strata of the Limagne,
components and characteristics of the,

15-17.

Calcareous peperino, examples of, where
found, 18-21; analogy between those of
the Limagne and of the Vincentin, 19 n.;
beauty of that of Pont du Château, 20.
Calcariferous springs of Auvergne, lo-
calities of the, 21-23.
Camaldoli, 78.

Canary Isles. See Lancerote.
Cane, Grotta del, 85, 193.

CANTAL, 3, 38, 39, 48, 49, 114, 115, 124
n., 127 n., 134 n., 139, 140, 144, 155,
156, 167, 172, 175, 198, 199, 200,
209, 211; vestiges of deposits of
freshwater lakes in the, 2; similarity
of its freshwater formation to that of
the Limagne, 24; its locality and dis-
tinctive features, ib.; difficulty of ascer-
taining its original limits, 25.

VOLCANIC REGION OF THE CANTAL,
its figure: point of difference between its
lava-current and that of the Mont Dore,
145; character of its valleys, 145, 146;
bulk, extent, and character of its conglo-
merates, 146; their origin due to com-
bined aqueous and igneous action, 147;
site of its central crater, 148; vast extent
of its basaltic beds, 149; interesting con-
figuration of the basaltic prisms of the
Montagne de Bonnevie, 150; difficulty
in removing them unbroken, ib.; alleged
former auriferousness of the Jourdanne
river-sand, 151 n.; relative age of the
Mont Dore and Cantal volcanic remains,
not determinable, 152; cause of impedi-
ment to the basaltic ramifications E. and
S.E. of the latter region, 154; height of
the Plomb du Cantal, 232.
Capucin, le, 131.

CARLADEZ.

Carladez. See Vic en Carladez.

Cassini's map, 52.

Catania, 65, 157 n.

"Causses" of the Cevennes, 4.

Central France. See France, Central.
Cèr (or Cère), the, 25, 146, 148, 151, 152.
Cevennes, elevation of the rocks in the
region of the, 2; defensive advantages of
the district to the Protestants persecuted
by Louis XIV., 4, 5,
Cezallier, Montagnes de, 139.
Chadrat, 10.

Chaise Dieu, la, 26, 154, 157.
Chalar (or Chalard), Puy de, 80, 81, 94.
Châlons sur Saône, central position of, 1.
Chalucet, 23, 49, 198; composition of its
basalt, 98.
Chamablanc, 132.

Chamalières, 26, 179.
Chambeyrac, 178.

Chambon, 114, 124, 133, 134, 135, 140,
141.

CORNON.

Chesnut-trees, volcanic soil most favour-
able to the growth of, 190.
Chidrac, 135.

Chiliac, 184.

Chimborazo, 69.

Chopine, Puy, 46, 71; a perplexing enigma
to the geologist, 72; the author's deduc-
tions regarding it, 73-75; origin of its
elevation, 75; its height, 232.
Chuquet Geneto, 87; explanation of the
term "Chuquet," ib. n.
Civita Vecchia, 120.

Clermont, 20, 21, 22, 23, 31, 33, 34, 40,
67, 85, 86, 98, 132, 211.

Clermont and Chanturgue, Côtes de, once
evidently united, though now separated,

104.

Clermont Ferrand, 39.
Clersat, 66.

Cliergue, Le, 128, 132,

Cliersou, Puy de, situation and peculiar
shape of the, 66; its caves perforated by
the Romans, ib.; M. Ramond's hypothesis
relative to this puy, 67; its height, 232.
Clinkstone of Mont Mezen. See Mont
Mezen.

Coal-measures, strata associated with the, 3;

localities of the principal coalfields, 4.
Coiron, volcanic region of the, 161, 162;
fanciful appellation bestowed by the
peasantry on its basaltic phenomena, 163,
164; basaltic rock of Rochemaure, 164;
instructive features connected with the
basaltic currents of this region, 165, 166.
Col de Cabre, 149; its height, 232.
Colière, Puy de, not noticed by previous
writers, 86; characteristics of its basaltic
products, 86, 87.

Combegrasse, Puy de, 94.

Côme, Puy de, regularity of the conical
form of, 55, 56; prodigious dimensions
of its lava-current and phenomena con-
nected therewith, 56-61; its height,
232. See also 66, 79, 89.
Compains, Valley of, 143.
"Cones of eruption," 41 n. t.
Conglomerates of Mont Dore, see Mont
Dore; tendency of conglomerates to waste
into pyramidal form, 172 n.
Coquille, Puy de la, 77.

Coran, Chox de, dimensions of the crater,

and composition of the strata of the, 111.
Coran, Puy de, 13; circumstances which
entitle it to attention, 111, 112.
Cordier, M., 35, 232.
Cordilleras, the, 134 n.

Corneille, Rocher, 172, 175, 181.

Cornon, Puy de, once the bed of the Allier,
112.

Dallet, Puy de, 12, 15, 17, 112, 200; its
height, 233.

Daubeny, Dr., 35, 37.

D'Aubuisson, M., 34, 51, 65, 72, 122 n.
Davayat, 12.

Decize (Nièvre), 4, 211.

Denise, Montagne de, 180, 181, 182, 183.
Dent du Marais, 135.

Desmarest, M., 31, 32, 33, 47, 52 n.
Dienne, 149.

Diluvian theory, remarks on the intenabi-

lity of the, 204, 207 n.

Dogne, the, 116, 125. See Dore and Dogne.
Dolomieu, M., references to the opinions of,
32, 48.

Dôme, Monts. See Puys, chain of.
Dôme, Petit Puy de. See Puy, Petit.
Dôme, Puy de, elevation, &c., of the, 45;
composed entirely of domite, 45-47 (see
Domite); its measurement, &c., 52, 53,
232; mode of its production not indicated
by its structure, 54. See also pp. 3, 4, 39,
41, 48, 49, 50, 51, 66, 68, 69, 78, 86,
87, 89, 129, 155, 232.

Domite, a variety of trachyte, why so called,

45; its characteristics, 46; its extreme
liability to decomposition and volcanic
nature, 47; hypotheses of various natu-
ralists on the subject, 47-49; odour
given out by it when rubbed, 53; M. le

FOSSILS.

Coq's hypothesis relative to the domitic

puys, 70 n.

Dordogne, 4, 5, 114, 126, 127, 132, 134 n.,
135, 137, 139, 140, 146, 149.

Dordogne, Lot, and Aveyron, character of the
lias underlying the oolite in the depart-
ments of, 5.

Dore, Mont. See Mont Dore.
Dore, the, 112, 116.

Dore and Dogne rivers, point of union of
the, 116, 124, 128.

Douc, Montagne de, 168, 171, 174.
Drachenfels, 130.

Drôme, 1.

Durbise, la, 128.

Durtol, 64, 104.

Egaules, 67.

Egravats, Ravin de, 131 n.

Eiffel, 78, 81.

Emblavès, 26, 178, 179.

Enfer, Puy and Vallée de l', 94, 126.
Entraigues, 194.

Enval, 89.

Eraignes, Puy d', 143.

Erieux, 162.

Escobar, M., 116 n.
Escoutay, 165.

Espinasse, la Narse d', 94.
Etang de Fung, 59.
Etang, P', 83.
Eternity. See Time.
Etna. See Etna.
Euganean Hills, 130.
Expailly, 171, 181, 182 n.
Eysenac, Montagne d', 180.

Falgoux, 147.

Faujas de St. Fond, M., 31, 32, 165, 187,
192, 245.

Fauna of Central France. See Organic
remains.

Fay, 179.

Fay-le-Froid, 167.

Ferrand, Puy, 124, 125, 133.
Ferrara, M., 116 n.
Filhou, Puy de, 61.
Fontanat, 86.

Fontaulier, the, 185, 187.
Font de l'Arbre, 86.
Fontfredde, 89, 90, 91.
Fontmore, 64.

Forèz, the, 1, 2, 7, 28, 210. See Auvergne
and Forèz.

Fortresses, ruined, on the peaks of the
Auvergne, and ultimate fate of their
occupants, 102 n.

Fossils and organic remains of the Haute
Loire, 229, 230. See Organic remains.

FOURNET.

Fournet, M., 35 n.

Fraisse, Puy de la, 66, 67, 70.
France, Central, division line of, 1; geolo-
gical features of the country on either
side of this line, 1-5; theory of the
French geologists relative to the pro-
duction of its volcanic rocks, 200; table
of heights of the volcanic districts, 232.
Freshwater lakes of the tertiary period,
proofs of the former existence of, 2, 6;
probable cause of their drainage, 6; their
boundaries easily recognisable, ib.; lakes
of La Caissière and d'Aidat, 92; peculiar
features and probable origin of Lakes
Pavin and Mont Sineire, 143, 144; ques-
tion of the original level of the lake-
basins of Central France, 210-213.
Cantal, Haute Loire, Limagne d'Auvergne,
Menat, Montbrison.

Gannat, 10, 12.
Gard, 3, 4.

Garges, 4.

See

Geology of Central France in the regions
of the Auvergne, Forèz, Gevaudan,
Vivarais, and the Valley of the Rhone,
1, 2; freshwater deposits of the ter-
tiary period, 2; crystallizations in the
granite, ib.; metals and their localities,
2, 3; purity of the kaolin of Limoges,
3; absence of the Cambrian, Silurian,
and Devonian series of strata, 3; coal-
measures and their localities, 3, 4; extent
of limestone strata of the lias and oolite
group, 4; aspect of the " causses in
the region of the Cevennes, 4, 5; lesson
taught by geology relative to the im-
mensity of the world's epochs, 208, 209
and n.; Sir Charles Lyell's summary of
the geological characteristics of Central
France, 213, 214. See Organic remains,
Volcanic formations, Volcanic remains,
Volcanic rocks.

Gerbier des Jones, 157.
Gerbison, 179.

Gergovia, 12, 15; volcanic constituents of
the mountain of, 17, 18, 200, 203; geo-
logical and antiquarian interest attaching
to it, 106 and n. †; difference between
its basalt and that of La Serre, 204. See
Girou.

Gevaudan and Vivarais, surface elevation
attained in the region of the, 1.
Gimeaux, 23.
Gironde, 1.

Girou, Puy, 12; this puy and Puys de
Jussat and Gergovia originally a single
plateau, 106; character of the stratifi-
cation of the region, 107; line of contact

HAUTE LOIRE.

between the basalt and the limestone
well defined, 108; its altitude compared
with that of adjacent puys, 109; its
height, 233.

Godivel, La, 144.
Goul, the, 146.

Goules, Puy des, 67, 69, 70; its height, 233.
Gour de Tazana. See Tazana.
Gouette, Puy de la, 71, 72, 73, 75.
Grange, Pan de la, 125.

Grange, Puy de la, 132.

Granite rocks of Central France, varying
character of the, 2.

Graveneire, Puy, 44, 83, 99n., 100; its
puzzolana in much request, 84; non-
existence of a crater, ib. and n.; cha-
racter of its lava rock, 85; its gaseous
springs, ib.; industrious cultivation of
the district, 86; its height, 233.
Gravouse, Puy de la, 91, 92.
Gresinier, 64, 105.

Griou, Puy, 148.

Gromanaux, Puy de, 87.

Gros, Puy, 136, 137; its height, 232.
Grotta del Cane, French springs analogous
to the, 85, 193.
Guery, Lake, 137.

Guettard, M., an early observer of the vol-
canic phenomena of Central France, 30;
small credit given to his memoir thereon,

31.

Guiolle, La, 39, 150.

Hamilton, Sir W., on the lava-current of
Ætna, 117 n.

Hamilton and Strickland, Messrs., on the
volcanos of Asia Minor, 210 n.
Hautechaux, Puy de, 133.

Haute Loire, freshwater formation of the
basin of the, 25; extent and depth of the
superimposed volcanic rocks, ib.; limits
of the original basin, outlets of the
Loire, 26; constituents of the lower
series of lacustrine beds, 26, 27; extent
and variety of their organic remains, 27;
possible cause of the drainage of the lake,
ib.; points of resemblance between the
rocks of this district and the peperino of
the Auvergne lake basin, 28; probable
cause of the accumulation of the water
into a lake, 179.

VOLCANIC REGION of the HAUTE
LOIRE and ARDÈCHE (ci-devant pro-
vinces of the Velay and Vivarais),
154; natural boundary of this district
and the Cantal, 155; its calcareous
formation entirely cased in granitic rock,
198; region of Mont Mezen and its
dependencies, see Mont Mezen. Volcanic