A collection of short pieces comprising two pieces for the right hand alone and two pieces for the left hand alone. This is Rocherolle's sole piano work for one hand. All pieces exhibit a romantic character while maintaining a solid classical style. The difficulty level is relatively high, demanding a technical proficiency comparable to Czerny's School of Velocity, Op. 299. The precise fingerings provided at crucial points are highly beneficial, offering an opportunity to master techniques directly conducive to smooth one-hand solo performance. Furthermore, these pieces can serve as etudes for identifying and reinforcing imbalances or weaknesses in a single hand that might go unnoticed during two-hand playing.