The natural horn is a musical instrument descending from the hunting horn, and is the predecessor to the modern-day French horn. Differentiated by its lack of valves, natural horn relies on a variety of crooks and hand stopping techniques to play the instruments full range. Throughout the seventeenth and eighteenth centuries, the natural horn evolved separate from the trumpet by widening of the bell and lengthening of the tubes. Natural horn consists of a mouthpiece, a pitched crook, foundational tubing, and flared bell. This instrument was used extensively until the emergence of the valved horn in the early 19th century.