The Freebooters — Gustave Aimard

All the wood rangers have noticed, with reference to the immense virgin forests which still cover a considerable extent of the soil of the New World, that, to the man who attempts to penetrate into one of these mysterious retreats which the hand of man has not yet deformed, and which preserve intact the sublime stamp which Deity has imprinted on them, the first steps offer almost insurmountable difficulties, which are gradually smoothed down more and more, and after a little while almost entirely disappear. It is as if Nature had desired to defend by a belt of thorns and spikes the mysterious shades of these aged forests, in which her most secret arcana are carried out.