Book ReviewsScientific Books Gesammelte Werke By J. U. NEF See allHide authors and affiliations Science 17 Aug 1906:Vol. 24, Issue 607, pp. 211-213DOI: 10.1126/science.24.607.211 J. U. NEFFind this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.