Marcel Hardy's letters cover various aspects of his career. He bought an estate in Mexico and describes his progress and schemes for colonisation of the area. There are notes and a typescript (folio 47) on the Tezonapa Valley Colonisation Lands, giving a description of the area, climate and soil types, revenues, etc. The typescript does not correspond with the manuscript notes. Later letters concern world problems and Hardy's attempts to make a career in Europe. A letter from Patrick Geddes to Hardy, dated 1923 (folio 160) is published by Philip Mairet in ‘Pioneer of Sociology’, page 193. There are also several letters to Geddes from Hardy's wife and daughter on family affairs.