Every term with empirical significance must be capable … characteristic of the liberalized versions of positivism and … of all terms of empirical science by means … not seem to offer an adequate means for …  … now take, for example, the concept of length … points may assume any positive real number as … condition [for unmeasurably small differences or irrational numbers].    
     Google-1
     Google-2
   
   Copyright clearance needed for quotation.