, great height of fossil
Coal-dust, danger from
Coal formed in large lakes or closed seas
Coal formation, geological position of
Coal formed by escape of gases
Coal-mine, the
Coal not the result of drifted vegetation
Coal-period, climate of
"Coal-pipes"
Coal-plants, classification of
Coal-seam, each, a forest growth
Coals of non-carboniferous age
Coal, vegetable origin of
Coke
"Cole"
"Condensers"
Cones of _Lepidodendra_
Conifers in coal-measures
Current-bedding in sandstone

D.

Davy-lamp
Dangers of benzene
Darwin on the Chonos Archipelago
Diamonds, how made artificially
Disintegration of vegetable substances
Disproportion in relative thickness of coal and coal-measures

E.

Early use of coal
Effects of an explosion
Encrinital limestone
_Equiseta_
"Essence de mirbane"
European coal-fields
Evelyn on the use of coal
Experiments illustrating fossilisation

F.

Filling retorts by machinery
Firedamp
Fire, mines on
First light oils
First record of an explosion
Flashing-point of oil
Flooding of pits
Fog and smoke
_Foraminifera_
Fossil ferns
Fructification on fossil-ferns
Furnace, ventilating

G.

Gas, coal
Gasholder, the
Gas, house, constituents of
_Glossopteris_
Graphite
"Green Grease"

H.

Hannay, of Glasgow
Heavy oils
Humboldt's safety-lamp
Hydraulic Main

I.

Impurities in house-gas
Indian coals
Insertion of rootlets of _stigmaria_
Insufficiency of modern forest growths
Ireland denuded of coal-beds
Iron, supplies of

L.

_Lepidodendra_
_Lepidostrobi_
Lignite
London lit by gas

M.

Mammoth trees
Marco Polo
Marsh gas
Medium oils
Metamorphism of coal by igneous agency
Methods of ventilation
Mountain limestone
Murdock's use of gas
Mussel beds

N.

Napthalin
_Neuropteris_
Newcastle, charters to
Nitro-benzole

O.

Objections to use of coal
Oils from coal and lignite
Oil-wells of America
Olefiant gas
_Orthoceras_

P.

Paraffins
Peat
_Pecopteris_
Pennsylvanian anthracite
Persian fire-worshippers
Pitch
Plumbago
_Polyzoa_
Prejudice against aniline dyes
Prohibitions of the use of coal
Proportions of explosive mixtures
_Psaronius_
"Purifiers"
Pyrites in coal

Q.

Quantity of coal raised in Great Britain

R.

Reptiles of the coal-era
Resemblance of American and British coal-_flora_
Retorts
Roman use of coal
Rosanilines, the
Royal Commission of 1866

S.

Sandstone, how formed
Shales
_Sigillaria_
South American coals
Spores