With some of these restatements, Popper leaves the fingerings and bowings intact. There are also places where the bowings are not the same. It seems to me that we should adhere to the slurrings and bowings which Popper gives us, with the exception of an early stage of development when our task is to learn the notes of the etude. We should not change the bowing so it all becomes uniform. Popper, after all, was a careful composer, and I think he served as his own editor