Sebastian Lee lived from 1805 to 1887. He was a talented musician and a pupil of cellist Johann Prell, who had studied with B. Romberg (also no stranger to us). Lee was principal cellist in The Grand Opera Orchestra in Paris. He taught in Paris until 1868 and then returned to Hamburg. Lee did much for cello technique. He combined what he had learned in Germany with the trends in Paris. His methods were accepted and used at the Paris Conservatory and were dedicated to Louis Pierre Norblin, the cello professor in Paris. Lee's methods are still used everywhere. And rightly so, because they contribute to good cello technique.
The Studies Lee op. 31 are beautiful melodic studies/études for cellists who can already easily find everything in the first position. This also includes the major and minor hand positions. If you would like to start working on position playing, this is a fine book for that purpose. The first through fourth positions are all covered, along with a small introduction to setting the thumb in the thumb position. Furthermore, there is plenty of challenge to improve your bowing technique as well.