Images of scientists including Carl, Carlisle, Carnot, Cavalio, Chabeneau, Champollion, Chatelain, Chebishef, Chevreul, Claison, Clausius, Cnopf, Comte, Condamine, Condorcet, Congreve, Conring, Copernicus, Coram, Cornus, Crell, and Curtius are available here.  Digitized by Mary Parker.