CHASE

The marginal mark presumably refers to the change of bowing on the first note.

This N (not F. David's) seems, from its context elsewhere in the volume, to indicate Nut (i.e. the heel of the bow).

The Fr (Frosch) indicated the heel of the bow.

Here saltato evidently indicates a thrown, rebounding bowstroke for the demisemiquavers. David uses Saltato elsewhere in his editions of Baroque music as an instruction for the use of a springing bow. It appears printed for example in his 1843 edition of the Bach Chaconne. this website. No examples, either printed or manuscript, have been found in his editions of Classical German repertoire from Haydn to Schubert, but he wrote it by hand in his personal copies of Volkmann and Cherubini quartets and it also occurs in the first movement of his copy of Mendelssohn's String Quintet op. 18. Elsewhere, as on the next stave, David seems to use it to mean what he describes in his Violinschule as hüpfend (sautillé).

Here, unlike the printed example on the previous stave, David seems to use saltato to indicate an elastic sautillé style bowstroke. The term is defined in this sense by Jockisch see this website.