ABSTRACT
IN reviewing the History and geological position of vegetables which have passed into the state of mineral coal, we have seen that our grand supplies of fossil fuel are derived almost exclusively from strata of the Transition series. Examples of Coal in any of the Secondary strata are few and insignificant; whilst the Lignites of the Tertiary formations, although they occasionally present small deposits of compact and useful fuel, exert no important influence on the economical condition of mankind. *
