The right hand, being the most skilful, is supposed to play with expression, and really does so; but this only makes the performance the worse.

The fundamental tone is wanting, and you are led to make a mistake in the skip, and strike the wrong key.

Finally, the whole thing is ended in terror.

I have an uneasy night; I dream of your fine hands, but the false and the weak notes start up between like strange spectres or will o' the wisps, and I wake with the headache, instead of with pleasant memories.
Allow me to give you a piece of advice.

Play and practise the bass part a great deal and very often, first slowly, then quicker, during one or two weeks, before playing the right hand with it, in order that you may give your whole attention to playing the bass correctly, delicately, and surely.