publication of the present edition of Humboldt's celebrated work,
as a portion of the SCIENTIFIC LIBRARY.

Prior to the travels of Humboldt and Bonpland, the countries
described in the following narrative were but imperfectly known to
Europeans. For our partial acquaintance with them we were chiefly
indebted to the early navigators, and to some of the followers of
the Spanish Conquistadores. The intrepid men whose courage and
enterprise prompted them to explore unknown seas for the discovery
of a New World, have left behind them narratives of their
adventures, and descriptions of the strange lands and people they
visited, which must ever be perused with curiosity and interest;
and some of the followers of Pizarro and Cortez, as well as many
learned Spaniards who proceeded to South America soon after the
conquest, were the authors of historical and other works of high
value. But these writings of a past age, however curious and
interesting, are deficient in that spirit of scientific
investigation which enhances the importance and utility of accounts
of travels in distant regions. In more recent times, the researches
of La Condamine tended in a most important degree to promote
geographical knowledge; and he, as well as other eminent botanists
who visited the coasts of South America, and even ascended the
Andes, contributed by their discoveries and collections to augment
the vegetable riches of the Old World. But, in their time, geology
as a science had little or no existence. Of the structure of the
giant mountains of our globe scarcely anything was understood;
whilst nothing was known beneath the earth in the New World, except
what related to her mines of gold and silver.

It remained for Humboldt to supply all that was wanting, by the