  According to Russell, analysis proceeds in stages.  When analysis shows the terminology and presuppositions of one stage of analysis to be definable, or logically constructible, in terms of simpler and more basic notions, this is a philosophical advance, even if these notions are themselves further analyzable. As Russell says, the only drawback to a language which is not yet fully analyzed is that in it, one cannot speak of anything more fundamental than those objects, properties or relations that are named at that level (e.g., LA, 337).