Question III HERMEAS saying that he approved both reasons, why then (continued I) do not you explain the proportion, if there be any, of the number of the letters; for, in my opinion, there is; and I think so, because the number of mutes and semi-vowels, compared between themselves or with the vowels, doth not seem casual and undesigned, but to be according to the first proportion which you call arithmetical. For their number being nine, eight, and seven, the middle exceeds the last as much as it wants of the first. And the first number being compared with the last, hath the same proportion that the Muses have to Apollo; for nine is appropriated to them, and seven to him. And these two numbers tied together double the middle; and not without reason, since the semi-vowels partake the power of both.