The Commens Dictionary
Quote from ‘Logical Tracts. No. 1. On Existential Graphs’
The sheet on which the graphs are written (called the sheet of assertion), as well as each portion of it, is a graph asserting that a recognized universe is definite (so that no assertion can be both true and false of it), individual (so that any assertion is either true or false of it), and real (so that what is true and what false of it is independent of any judgment of man or men, unless it be that of the creator of the universe, in case this is fictive); and any graph written upon this sheet is thereby asserted of that universe; and any multitude of graphs written disconnectedly upon the sheet are all asserted of the universe.
MS [R] 491:3
‘Sheet of Assertion’ (pub. 13.01.15-12:37). 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-logical-tracts-no-1-existential-graphs-12.