Heinrich Wilhelm Ernst

Heinrich Wilhelm Ernst
Violin

In all the concerts Ernst played and repeated the kaleidoscopic Carnival of Venice, which, even when heard a hundred times, never loses the charm of novelty, and is always furnished by the inventive virtuoso with newly improvised variants [Veränderungen] […]. Ernst has made out of it a fantastical fairy-tale-like music- reworks […]. It is amazing what an end- less wealth of metamorphoses this small, plain melody is capable of.

Prague?
Correspondance report from Prague in [Leipziger] Allgemeine Musikalische Zeitung 47 (1845), col. 453.
1845
In the article “Violin Improvisation in the Early Nineteenth Century: Between Practice and Illusion” Dana Gooley suggests these were not real improvisations