Media type: E-Article Title: LIV. On a proposed test of the necessity of indirect proof in geometrical demonstrations, with remarks on methods of demonstration Contributor: Adamson, James imprint: Informa UK Limited, 1853 Published in: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science Language: English DOI: 10.1080/14786445308562720 ISSN: 1941-5982; 1941-5990 Origination: Footnote: