The Commens Dictionary
Quote from ‘On the System of Existential Graphs Considered as an Instrument for the Investigation of Logic’
A calculus […] is a system of symbols by transforming which according to a certain routine one is enabled to pass from a premiss to a conclusion in a particularly speedy and direct way.
MS [R] 499
‘Calculus’ (pub. 24.08.17-11:10). 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-system-existential-graphs-considered-instrument-investigation-logic.