From the Robin Catalogue:
A. MS., n.p., [1866], 28 pp. and 8 pp. of different drafts; plus a quotation from Herbart.
First sense impressions are not representations of unknown things but those things themselves. Sensation and conception as representations. Universal conceptions: Substance and Being, with the intervening conceptions of Ground, Correlate, and Interpretant. Quality, relation, and representation. The three kinds of representations. Icon, index, and symbol. Division of symbol into term, proposition, and argument. Kinds of terms. Hamilton’s views considered. The classification of the sciences.
Published as W 1:471-488.