This treatise is by Dr. Serge Barjansky, a friend and colleague of Gaylord Yost. Dr.Yost discusses its relevance in his own treatise “The Basic Principles of Violin Playing” on pages 28 and 29. Dr. Barjansky book reveals his thoughts on what he considers to be an infallible physical basis of tone production and bow mastery. Advanced students who scrupulous applied the theories developed in the treatise have increased their tonal development and bow mastery enormously in a short period of time.