Principles of Orchestration by Nikolay Rimsky-Korsakov.
In his "Memoirs of my musical life" (.
We have in our possession a thick note book of some 200 pages in fine hand writing, dating from the years 1873-1874, containing a monograph on the question of acoustics, a classification of wind instruments and a detailed description of the construction and fingering of the different kinds of flute, the oboe, clarinet and horn.
Rimsky-Korsakov had long been engrossed in his treatise on orchestration.
Principles of Orchestration by Nikolay Rimsky-Korsakov