LettersDiscussion and Correspondence SECULAR PERTURBATIONS OF THE INNER PLANETS By Harold Jeffreys See allHide authors and affiliations Science 16 Sep 1921:Vol. 54, Issue 1394, pp. 248DOI: 10.1126/science.54.1394.248 Harold Jeffreys Find 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.