Jean Chacornac, French astronomer (b. 1823) September 28 – Émile Gaboriau, French writer (b. 1833) October 5 – William Todd, American businessman, Canadian Senate nominee (b. 1803) October 9 – George Ormerod, English historian, antiquarian (b. 1785) October 17 – Sir Robert McClure, British Arctic explorer (b. 1807) December 14 Louis Agassiz, Swiss-born geologist, naturalist (b. 1807) Alexander Keith, Scottish-born brewer, mayor of Halifax, Nova Scotia (b. 1795) References Further reading and year books 1873 Annual Cyclopedia (1874) highly detailed coverage of "Political, Military, and Ecclesiastical Affairs; Public Documents; Biography, Statistics, Commerce, Finance, Literature, Science, Agriculture, and Mechanical Industry" for year 1873; massive compilation of facts and primary documents; worldwide coverage; 831pp