CHASE

Here, and lower down the page, Singer indicates the 'Luft Pause' between the end of a sudden crescendo and a following piano.

This unusual fingering, repeated later in the movement, is clearly designed solely to produce a portamento connection between the notes of the dotted 8th/16th figure.

Here and four staves later, the 'Luft Pause' is used, as in the first movement, between the end of a crescendo and a subito piano.

It is unclear why, in this instance, Singer uses the slanting line where a portamento is in any case indicated by the fingering and slurring. Probably he wanted to encourage the player to make the portamento particularly prominent.

This implies a martelé bowstroke.

Here as on the previous page, the slanting line seems to be used to encourage a more prominent portamento than the player might otherwise have produced.