The Commens Dictionary
Quote from ‘Chap. XI. On Logical Breadth and Depth’
Substantial depth is the real character as it exists in the object, which belongs to every thing of which a term is predicable with absolute truth.
‘Substantial Depth’ (pub. 28.11.15-11:13). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-chap-xi-logical-breadth-and-depth-7.