In this Marcia, Professor and student talk about sforzato and dynamics in forte. Referring to vibrato, it is necessary to measure out and not exaggerate. As regards the arm position, the left elbow should not be placed not very low, it is better if we keep it in the same position for all the strings. In the passage of double stops, it is advisable not to loose the wrist. Helmerson explains one way to play the harmonics: the bow is faster and the sound of the last note does not stop.