No. 21.
Several editions of Fiorillo suggest varied bowings for this étude. We have practiced varied bowings with Kreutzer, Sevcik, and other works. One should be familiar with bowings before the study of Fiorillo. The content of the étude must only be considered. Use a light legato bowing near the point. The question has often been asked, “Does the thumb bend in the fifth position?” After we leave the 3d position, the thumb becomes flat under the neck of the violin. Be very careful of intonation when the key changes. At this point do not change position. It is an invariable fault of students:
A quick transfer from third to second position must be made easily. All passages of a chromatic nature, or in which there are sudden modulations, should be played a good deal until correct intonation is assured. Owing to the great similarity between Nos. 20 and 21, it is wise to play the twenty-second before the twenty-first.