The Commens Dictionary
Quote from ‘A Sketch of Logical Critic’
Tagmatic Science may be defined as all that knowledge that is collected in books for a purpose other than that of showing how it can be usefully applied to a definite purpose or class of purposes, but for one of these three ends, 1st, to enable those who consult the books to learn all known facts concerning certain subjects, 2nd, to furnish the history of attempts to gain certain kinds of knowledge or 3dly, to base upon the the collection some theory or philosophy of science.
MS [R] 673:47
Earlier in MS [R] 673, the term "tagmatic science" is introduced as a synonym of "science of review"
‘Science of Review’ (pub. 30.04.15-15:31). 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-sketch-logical-critic-2.