Liszt is such an immense, inspiring force that one has to try and stride forward with him at double rate, even if with double expenditure, too! To-day I'm more dead than alive, as we had a lesson from him yesterday that lasted four hours. There were twenty artists present, all of whom were anxious to play, and as he was in high good-humour, he played ever so much himself in between. It was perfectly magnificent, but exhausting and exciting to the last degree.