Full Idea
'Logical constants', which might seem to be entities occurring in logical propositions, are really concerned with pure form, and are not actually constituents of the propositions in the verbal expressions of which their names occur.
Gist of Idea
Logical constants seem to be entities in propositions, but are actually pure form
Source
Bertrand Russell (The Theory of Knowledge [1913], 1.IX)
Book Reference
Russell,Bertrand: 'The Theory of Knowledge', ed/tr. Eames,ER /Blackwell,K [Routledge 1992], p.98
A Reaction
This seems to entirely deny the existence of logical constants, and yet he says that they are named. Russell was obviously under pressure here from Wittgenstein.