Augustine describes, we might say, a system of communication; only not everything, ˇhowever, that we call language is this system.
      (And this must be one must sa[i|y]d in ever s[l|o] many cases whe[r|n]e the question arises, :can is this ˇan appropriate description be used or can't it be used? or not?”. The answer is, “Yes, it
is appropriate
can be used
; but only for this narrowly restricted field, not for everything that you were profess[ing|ed] to describeˇ by it.” Think of the theories of the economists.)