LettersDiscussion and Correspondence THE ROYAL PHOTOGRAPHIC SOCIETY By A. J. Newton See allHide authors and affiliations Science 15 Jun 1928:Vol. 67, Issue 1746, pp. 608DOI: 10.1126/science.67.1746.608-a A. J. NewtonFind 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.