Charles Peirce. Whipple, photographer. Carte-de-visite. Boston, undated. Charles Sanders Peirce papers, CSP 1643.
"Chas. S. Peirce has been writing some very acute and original psychologico-metaphysical articles in the St. Louis philosophic Journal... He is an original fellow, but with a capacity for arbitrariness that makes one mistrust him." -- Letter to Henry Bowditch, 22 May