This volume is companion to “The Key to the Mastery of the Finger-Board“. Here, the same principles are followed in the solution of the vast and complex problem of right-arm technique. Bowing presents this problem because there are easily millions of rhythmical variations, accents, and inflections in using a bow. In attaining a competent technical command of bowing, there are very definite and well-defined fundamental principles which form the entire structure of the bowing mechanism.