Wherever there has been a semblance of a general criterion, to my knowledge, there has been either some drastic failure such as tended to admit all or no sentences as analytic, or there has been a circularity of the kind noted three paragraphs back, or there has been a dependence on terms like 'meaning,' 'possible,' 'conceivable,' and the like, which are at least as mysterious and in the same way) as what we want to define.