269. The deaf and dumb converse with each other, and with their teachers, by signs made with their hands. There are two ways of making the letters with the fingers; in one, both hands are used; in the other, only one. Above, you see how the letters are made with one hand.
270. When are the letters like the keys of a piano?
271.
Up and down two buckets ply
A single well within;
While the one comes full on high,
One the deeps must win.
Full or empty, never ending,
Rising now, and now descending,
Always while you quaff from this,
That one lost in the abyss,
From that well the waters living
Never both together giving.