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