1. H. D.Rolleston: “An Oration on the Classification and Nomenclature of Diseases with Remarks on Diseases Due to Treatment ”The Lancet May 22 1909 page1437.
2. First Annual Report of the Registrar‐General of Births Deaths and Marriages England 1839 page99.
3. Sixteenth Report of the Registrar‐General of Births Deaths and Marriages England 1853 page73.
4. J.Bertillon: “Cours Élémentaire de Statistique Administrative ”1895 pages262and 264.
5. Transactions of the American Medical Association 1872 Appendix.