The Commens Dictionary
Quote from ‘Letters to Christine Ladd-Franklin’
…I suppose matter is merely mind deadened by the development of habit.
‘Matter’ (pub. 21.10.15-18:05). 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-letters-christine-ladd-franklin.