INDEX. 
91 
De Beaumont, M. Elie, objections to the 
theory of, 341 
on modern granite of the Alps, 358 
De Candolle on the longevity of trees, 99 
De la Beche, Mr., on M. Elie de Beau- 
mont's theory, 347 
Delta, of the Niger, size of the, 329 
of the Nile, preyed on by currents, 28 
of Rhone, in lake of Geneva, 27 
De Luc, on the deluge, 271 
Deluge, on thechanges caused by the, 270 
i M. Elie Beaumont, on the cause 
of the historical, 148 
Denudation, effects of, 30, 32 
of the Valley of the Weald, 285 
Deposition, sedimentary, shifting of the 
areas of, 25 
Descartes, 97 
Deshayes, M., his comparison of the fossil 
shells of Touraine, S. E. of France, 
Piedmont and Vienna, 21 
his tables of fossil shells, 49 — see 
Appendix I. 
■ on the shells of the Val di Noto, 
series, 65, 67 
— on shells of the sub-Etnean beds, 79 
on the fossil shells of Ischia, 126 
on the fossil shells of the Antilles, 
133 
on the fresh-water shells of Colle, 
138 
on the fossil shells of the Crag, 171 
on the limestone of Blaye, 208 
— — — on the fossil shells of Volhynia and 
Podolia, 215 
on the fossil shells of Hungary, 223 
on the abundance of Cerithia in the 
Paris basin, 245 
— — on the changes which the Cardium 
porulosum underwent during its exist- 
ence in the Paris basin, 250 
• on the microscopic shells of the Paris 
basin, 251 
on the fossil shells of the Nether- 
lands, 276 
1 on the number of shells common 
to the Maestricht beds, chalk, and upper 
green sand, 325 
— on the distinctness of the secondary 
and tertiary fossil shells, 327 
■ on the secondary fossil shells of 
the Pyrenees, 343 
Desmoulins, M. Ch., on the Eocene depo- 
sits of the environs of Bordeaux, 209 
Desnoyers, M., on the organic remains of 
the Faluns, 205 
on the tertiary formations of Tou- 
raine, 20, 203 
on the resemblance of the English 
Crag and the Faluns of the Loire, 
204 
Desnoyers, M., on the fossil organic re- 
mains of the Orleanais, 219 
on the alternation of the plastic 
clay and calcaire grossier in the Paris 
basin, 244 
on the tertiary formations of the Co- 
tentin, 276 
on the marine tertiary strata near 
Rennes, 276 
Devil's-dyke, view of the chalk escarp- 
ment of the South Downs, taken 
from the — see wood-cut No. 65, 290 
Diagonal stratification of the Crag strata — 
see wood-cuts, 174, 175 
cause of this arrangement, 176 
Dikes, intersecting limestone, 69 
— — traversing peperino near Palagonia, 
— see diagrams Nos. 6 and 7, 69 
on the summit of the lime-stone 
platform, Val di Noto, 70 
off tuff or peperino, how formed, 
70 
changes caused in argillaceous strata 
by, 70 
on Etna, their form, origin, and com-> 
position, 90 
at the base of the Serra del Solfizio 
— see wood-cut, No. 19, 90 
changes caused by, in the escarp- 
ment of Somma, 91 
— — in the Val del Bove, as seen from 
the summit of Etna — see wood-cut No. 
22, 93 
some caused by the filling up of 
fissures by lava, 122, 123 
1 of Somma — see wood-cut No. 25, 
122 
cause of the parallelism of their op- 
posite sides, 122 
varieties in their texture, 124 
■ volcanic, in Madeira, 134 
strata altered by, 368 
Diluvial theories, 270 
Diluvial waves, whether there are signs of 
their occurrence on Etna, 101 
no signs of, in Campania, 128 
Dip and direction of the tertiary strata of 
Sicily, 73 
of the marine strata at the foot of 
Etna, 78 
Dominica, alternations of coral and lava 
in, 133 
Dorsetshire, valleys of elevation in, 308 
Dorsetshire and Cambridgeshire, great line 
of chalk escarpment between, 315 
Done, M. Bertrand de, on the fossil mam- 
miferous remains of Velay, 219 
on the lacustrine deposits of Velay, 
235, 236 
on the igneous rocks of Velay, 
262 
