In discussing another problem, Monro 141–2 warns us against allowing ourselves to be led ‘into the fallacy of thinking that relations which are distinct to us, because expressed by different language, were distinctly conceived by those who expressed them all in the same way;—the fallacy, in short, of supposing the distinctions of thought to be prior to the language which embodies them.‘ The warning seems to me of special value in dealing with my present problem.