Unpublished paper, 'On the constitution of the terpenes, camphors and camphor acids' by J [John] Norman Collie Collie presents an overview of existing research into the constitution of the terpenes, camphors and camphor acids and shares his observations. Annotations in coloured pencil and ink throughout. Subject: Analytical chemistry Received 29 April 1891. Read 28 May 1891. Communicated by [William] Ramsay. Written by Collie at University College, London. 1891