At the end of the lesson we will try them over once more, and before the next lesson you will know the names of all the white keys.

You must practise finding them out by yourself; you can't make a mistake, if you are careful to remember where the _c_ and the _f_ are.
I told you that the sounds this way (I strike the keys upward) grow higher, and this way (I strike them downwards) they grow lower.

So you see no tones are just alike: one is either higher or lower than the other.

Do you hear the difference?
Now turn round so as not to see the keys; I will strike two keys, one after the other; now which is the highest (the sharpest), the first or the second?
(I go on in this way, gradually touching keys nearer and nearer together; sometimes, in order to puzzle her and to excite close attention, I strike the lower one gently and the higher one stronger, and keep on sounding them, lower and lower towards the bass, according to the capacity of the pupil.) I suppose you find it a little tiresome to listen so closely; but a delicate, quick ear is necessary for piano-playing, and by and by it will become easier to you.

But I won't tire you with it any more now, we will go on to something else.