 In addition to a map of France showing rates of suicide by department, Guerry collected all the suicide notes found by the police in Paris over a four-year period.He classified these by the apparent motive expressed for taking one's life, perhaps the first content analysis in the social sciences.Around 1851, Guerry invented the Ordonnateur Statistique, probably the first mechanical device designed to aid in statistical calculations and the assessment of relationships among moral variables.