`  == Further sources ==   Notes for myself and anyone else who feels like joining in.   * My Philosophical Development - flicking through this, it may have some info about the theory, but I can't find it immediately. * Monk vol. 1 will almost certainly have something about it. * Possibly Human Knowledge: Its Scope and Limits?  MPD implies there is some stuff about Russell's theory of language in this one, but I haven't read it. * There is some typically opaque ``discussion`` of the theory in Wittgenstein's Tractatus (i.e. LW says some things about it without going very far into his reasons). * Oxford Companion to Philosophy has a good summary under descriptions.    `