seven different sized saxophones, of which four are commonly in use, and that particularly in French and American military bands. IV. The history of brass instruments is extensive; at the same time their development is easy to trace. But it must be remembered that only those instruments possess pedigree from which upper harmonics are produced, _i.e._ those constructed with long tube and narrow bore. Even this statement must be qualified in that the French horn is of modern extraction. Only trumpets and trombones, therefore, are directly descended from the early Roman instruments with cup-shaped mouthpieces, such as the lituus and buccina. And in the Middle Ages there existed side by side two such families,--the Zinken, and the trombe and tromboni. The Zink or cornetto had a wooden tube pierced by sounding holes, and was constructed in different sizes. The larger species was, at the close of the sixteenth century, transformed into the Serpent, which had a bell of brass. This instrument is still in use in some Italian military bands. The Zinken were extant in the hands of the "town musicians" even into the eighteenth century. Akin to them are the simple Alpine Horn and the Lur of Norway. In the Middle Ages the trumpet was generally made of brass, and the tube was at first unbent. The principle of sliding tubes for the purpose of procuring additional tones to the natural ones of an instrument was of ancient origin. It was applied to trumpets as well as to trombones, a practice still in force in England. The obvious advantage of this device was that a complete chromatic scale could be obtained, impossible for all other brass instruments at a time when crooks and valves were unknown. The earlier name for the trombone, _i.e._ bass trumpet, was sackbut, but the original appellation, buccina, has been perpetuated in the German Bosaun, now Posaune. In the sixteenth century, the tromba, synonym for clarino, trummet, together with the three _genres_ of trombones as used by the subsequent great classicists, was already perfected as a sliding-tube instrument. Or one might include both instruments under one heading by speaking of the tromba as a treble trombone. However, in order to obtain more efficient high brass instruments, constant experiments were made. The earlier improvements had obviated the clumsy length of brass instruments by bending and rebending their tubes. Then followed the application to the brass of the finger-hole system of the wooden Zinken. Finally, in the eighteenth century, the introduction of removable crooks improved the trombe as far as quality of tone is concerned. But the highest point of evolution was arrived at early in the nineteenth century, when the perfection of the chromatic valve principle revolutionized not only the mechanism but also the manner of writing for trumpets as well as for horns and bugles.