Besides these there is the half position (nut-position, or back-shift)
which, when enharmonically changed to
belongs to the first position.
The positions retain their names when the notes are sharpened or flattened a semitone, only one must frequently change the finger in enharmonic passages, or the position.
Changing the position.
Sliding from one position to another must be executed with ease and certainty, and it is especially necessary to grip the violin between the chin and the collar bone, in order to give the hand free play. Particular care must be bestowed upon
Sliding the fingers whilst
changing positions.
If in passing to a higher or lower position, the last note of the position just left, and the first of the position aimed at, have to be played by the same finger, it must slide over the string firmly, and without leaving it, whether the notes in question are legato or not.