Research index·Journal articleNotesNature·1 Feb 1904DOI10.1038/069396a0Journal articleNotesNature · 1904 · SubscriptionDOI10.1038/069396a0ReadRead at the publisherSaveCiteAdd to literature reviewPaywalledThe full text is at the publisherOpen it at the publisher to read it.Read at the publisherDiscussionAdd to the discussionTopicsGeologistMedalGold medalEnvironmental ethicsGeographyRelated papersMoreDetailsPublished, publisher, issueSuggest a correction or report
