INDEX TO CHEMISTRY, MINERALOGY, AND GEOLOGY. ill 
trimetric systems, 49 ; monoclinie system, 50 ; 
triclinic and hexagonal systems, 51. 
Datholite, nature and localities of, 71. 
Davy’s safety lamp, 37; apparatus for investi- 
gating the earths, 38. 
Descent of veins, theories of the, 133. 
Devonian system, characters of the, according 
to Hausmann, 145; according to Murchison, 
147 ; three sub-divisions of, ib. 
Diabase, 99 ; a certain kind of, denominated ball 
rock, 205. 
Diamond, properties of the, 55; process of 
grinding the, 82. 
Dichroite, 75. 
Diluvium, the, of Buckland, 188. 
Dimetrie system, fundamental 
forms of, 49. 
Dimyaria, the great variety of, in the transition- 
slate, 150. 
Dinotherium, the, 191. 
Diorite, 101; the most conspicuous 
amphibolie rocks, 205. 
Distillation, process of, 7. 
Dolerites, 98. 
Dolomite, characters of, in the transition-slate 
formation, 145. 
Drawing-slate, 110. 
Druses, nature of, 130. 
Drying apparatus, the, with sulphuric acid, 26. 
Dudley, subterranean fire at, 209. 
Dunes, nature of, 196. 
and derivative 
of the 
Earth, the, investigation into the causes of the 
irregularities and inequalities of the crust of, 
113 ; mean density of the crust, 114; general 
climatic features of, deducible from the loeali- 
ties of fossil remains, 136; improvement of 
organic forms with the increasing age of, 137; 
surface of the, in general, 218; speculations 
as to the condition of, at the first period of de- 
velopment, ib. 
Earth, common, 196. 
Earthquakes, 214; generally announce a vol- 
eanie eruption, 216 ; motions constituting, ib. 
Echini, the, conspicuous in the Jura formation, 
170 ; found in the cretaceous formation, 181. 
Echinoderms, relation between the structure of 
the fossil, and the embryological character of 
those of the present day, 149. 
Elements, the, as classed by the ancients, 1, 3; 
diversity between the ancient and modern idea 
of an element, 3 ; few substances to be found 
in an elementary state, 11; laws of the com- 
binations of the, 18; list of the, with their 
equivalents and symbols, 20; apparatus for 
combining gaseous, liquid and gaseous, and 
solid and gaseous, 21—and solid and liquid, 
23; method of ascertaining the amount of 
individual, in animal or vegetable substances, 26. 
Elephants, fossil, 192. 
Enaliosaurians, characters of the, 174. 
England, succession of strata in the coal forma- 
tion of, 155; oolitic strata in, 168 ; the cre- 
taceous formation developed most completely 
in, 177; fossils characteristic of the English 
cretaceous, 183. 
Eocene, the, 190. 
Epistilbyte, 76. 
Epterode, in Hesse, curious effect of subterranean 
combustion at, 209. 
Etna, mount, peculiarities of the veins of, 132; 
topography of, 217. 
Euclase, 74.. 
Eudiometer, description of the, 21. 
| Euphotide, 100. 
| Feldspar, 76, 84, 95; weathering of, in syenite 
rock, 204. 
Feldspathie rocks, composition of, 95. 
Felide, the diluvial, enormous size of, 193. 
Ferdinandea, island of, near Sicily, elevation 
and disappearance of, 215. 
Ferns, the, found in great numbers in the coal 
strata, 155 ; gigantic stems of, 156. 
Fetid marl, and limestone, 104. 
Filtering apparatus, 35. 
Fishes, fossil, enumeration of the principal in the 
Jura strata, 173; of the cretaceous formation, 
183 ; of the tertiary, 191. 
Flagstone, 94. 
Floetz, the, or secondary middle series, 157 ; 
the old, limestone, 158. 
Florence flasks, 36. 
Fluor-spar, 80. 
Formations, rock bed, 127; coal, 154; pro- 
duced under the influence of running or stand- 
ing water, 194. 
Fossii remains, 134; considered in a natural 
history and geognostical point of view, 134, 
135 ; occurrence of, 136 ; inferences as to eli- 
mate deducible from the localities of, ib. ; 
non-occurrence of, in the bottom rock, 140: 
found in the middle series, 143; fossils of the 
Silurian and Devonian systems, 148 ; of the ear- 
boniferous period, 155 ; numerous, in the second- 
ary middle series, 157 ; of the copper-slate forr- 
ation not well known, 160); of the rock selt 
formation, 161, 165; of the Jura formation. 
170; of the cretaceous system, 179 ; of the ex- 
caire grossier, 185; of the tertiary period, 19i). 
France, the Jura formation in, 168; division of 
the strata of the cretaceous formation in, 17::. 
Franconian Jura, the, 169. 
Fucoids, fossil, numerous in the Jura formaticn, 
170. 
Funnels, filtering, 35 ; separating, 36. 
Furnace, the wind, 4; the crucible, 5; the gal- 
ley, 25. 
Galena, localities and mineralogical characters 
of, 63 ; uses of, 64. 
Galerites, the, in the white chalk, 181. 
Gambay’s goniometer, 54. 
Gangue, explanation of the term, 130; alterna- 
tions of layers of, and’ ore, 131. 
Garnet, 74. 
Gas springs, 216. 
Gases, inquiry whether they may be converted 
into solids or liquids, 9 ; condensation of ear- 
bonie acid gas, 10; description of apparatus 
for obtaining gaseous elements, 12—for com- 
bining gaseous elements, 21. 
Gasometers, construction of, 22. 
Gasteropoda, characters of the, in the transition- 
slate, 151; represented in the cretaceous by 
the genus Acteonella, 182. 
Geognosy and geology or geogeny, definitions 
and subdivisions of, 87; general observations 
on, 88; relation of paleontology to geolozy, 
138; object of geology, ib. 
German silver, composition of, 61. 
Germany, the Jura of, a continuation of the 
Swiss, and divisible into three classes, 169. 
Geysers, the, in Iceland, 216. 
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