Research index·Journal articleNotesNature·1 Mar 1902NobleIDark:/48914/w1/20260515/C1DF4E10DOI10.1038/065471a0Journal articleNotesNature · 1902 · SubscriptionNobleIDark:/48914/w1/20260515/C1DF4E10DOI10.1038/065471a0ReadRead 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 discussionTopicsPolitical scienceLibrary scienceGeographyRelated papersMoreDetailsPublished, publisher, issueSuggest a correction or report