The author is confident that a careful contemplation of the family of augmented chords as presented in this work and verified by the ac companying illustrations will easily disperse the bogy mysteries with which this chord has been persistently surrounded. The study of harmony should be pursued simultaneously with the study of instrumental and vocal music. It should be thoroughly mastered and absorbed during the receptive periods of childhood and youth, not deferred until the musical character has been already formed and new lines of thought become unwelcome.