Research index·Journal articleNotesNature·1 Aug 1917DOI10.1038/099468a0Journal articleNotesNature · 1 Aug 1917DOI10.1038/099468a0ReadRead at the publisherSaveCiteAdd to literature reviewThe full text is at the publisherOpen it at the publisher to read it.DiscussionAdd to the discussionTopicsLibrary scienceSubject (documents)Scope (computer science)ProspectusIndex (typography)PublicationPlan (archaeology)MemoirRelated papersMoreDetailsPublished, publisher, issueSuggest a correction or report
