Commentary CAN WASTE OF MENTAL EFFORT BE AVOIDED By Florian Cajori See allHide authors and affiliations Science 29 Sep 1922:Vol. 56, Issue 1448, pp. 355-356DOI: 10.1126/science.56.1448.355 Florian Cajori 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.