LettersDiscussion and Correspondence A FACTOR FOR THE FOURTH CHROMOSOME OF DROSOPHILA See allHide authors and affiliations Science 19 Jun 1914:Vol. 39, Issue 1016, pp. 906DOI: 10.1126/science.39.1016.906-a HERMANN J. MULLERFind 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 below.