Russell was probably one of the witnesses of whom Richard Wagner remarked, in his essay on Beethoven, that they have testified to the incomparable impression which Beethoven made by his improvisations at the piano. And Wagner adds the following suggestive words: "The regrets that there was no way of writing down and preserving these instantaneous creations cannot be regarded as unreasonable, even in comparing these improvisations with the master's greatest works, if we bear in mind the fact, taught by experience, that even _less_ gifted musicians, whose written compositions are not free from stiffness and inelegance, sometimes positively amaze us by the quite unexpected and fertile inventiveness which they display while improvising." A similar remark was made by De Quincey, in pointing out the spontaneous origin of some of his essays: "Performers on the organ," he says, "so far from finding their own _impromptu_ displays to fall below the more careful and premeditated efforts, on the contrary have oftentimes deep reason to mourn over the escape of inspirations and ideas born from the momentary fervors of inspiration, but fugitive and irrevocable as the pulses in their own flying fingers." By way of illustrating this thesis a few more cases may be cited. Mozart used to sit up late at night, improvising for hours at the piano, and, according to one witness, "these were the true hours of creation of his divine melodies," a statement which, however, we shall presently see reason to modify somewhat. Schubert never improvised in public like Mozart, but only "in the intervals of throwing on his clothes, or at other times when the music within was too strong to be resisted," as Mr. Grove remarks. What an inestimable privilege it must have been to witness the spontaneous overflow of so rich a genius as Schubert! And once more, Max Maria von Weber writes that his father's improvisations on the piano were like delightful dreams. "All who had the good fortune to hear him," he says, "testify that the impression of his playing was like an Elysian frenzy, which elevates a man above his sphere and makes him marvel at the glories of his own soul."