The crwth presents still more troublesome questions, which we must admit are still less hopeful of solution. (See Fig. 22.) In this case we find an instrument played with a bow in northern Europe, far one side the course of Asiatic commerce, at a time when there was no such instrument elsewhere in the world but in India. Whence came the crwth? The rebec was not known in Arabia until nearly two centuries after we find the crwth mentioned by Venance Fortunatus. We have seen that the Sanskrit had four words meaning bow, a fact affording presumptive evidence of the knowledge of this mode of exciting vibrations, while the Sanskrit was still a spoken language. It is possible that the bow was a discovery of the Aryans in their early days, ere yet the family had begun to separate. The crwth may have been a survival of this primitive discovery, still cherished among a people not able to employ it intelligently, and not able to develop its powers. For while the crwth was in Europe two centuries before the violin, the improvement of this instrument was due to stimulation from quite another quarter. It was the Arab rebec that afforded the starting point for the modern violin, and this instrument was not known in Europe until it came in by way of the crusaders or the Spanish Arabs. [Illustration: Fig. 22.] Another popular instrument of music in all parts of Britain from the earliest of modern times, was the bagpipe, a reed instrument generally of imperfect intonation, the melody pipe being accompanied by a faithful drone, consisting of the tonic and its octave, and occasionally the fifth. It was the witty Sidney Smith who described the effect as that of a "tune tied to a post." This instrument was common in all parts of Britain until driven out by better ones. It still survives in Scotland. Its influence is distinctly to be traced in the Scotch melodies founded upon the pentatonic scale, of which the following is a specimen: [Music illustration: SCOTCH MELODY (IN THE PENTATONIC SCALE). The law-land lads think they are fine: But O they're vain and wondrou' gawdy! How much unlike that grace-fu' mien, And man-ly looks of no High-land Lad-die! O my bon-ny, ben-ny High-land Lad-die, O my hand-some High-land lad-die! when I was sick, and like to die, he row'd me in his high-land plai-die.] CHAPTER VII. THE ARABS OR SARACENS. Upon many accounts the influence of the Arab civilization was important in this quarter of the musical world, and it may here well enough engage our attention, since its most important aspects are those in which it operates upon the European mind, awakening there ideas which but for this stimulus might have remained dormant centuries longer.