silver, lead, wood, or wire, trimmed with bright coral and with little bells either inclosed in it or attached to the outside.”[100] Older boys make a rattle of a dried bladder, with peas in it. As I have dwelt on the probability of the invention of the first musical instruments by means of playful experimentation, I will now touch briefly upon another view. Karl Bücher, in his admirable treatise on Arbeit und Rhythmus, develops the hypothesis that rhythmic art is derived from physical labour. Physical labour which employs the limbs with perhaps some simple implement assumes spontaneously a rhythmical character, since this tends to conserve psychic as well as physical force. The sounds arising as the work proceeds suggest the germ idea of instrumental music and lead to involuntary vocal imitation. Thus, poetry and music are engendered in the very midst of toil, and only later, when they attain to independent existence, are dance motions substituted for the movements of physical labour, and frequently become adaptations of them (as in pantomime dances, for instance). Convinced as I am that this theory contains a genuine though perhaps one-sided[101] contribution to the proper explanation of rhythmical art, I am unable to concur in what Bücher regards as its logical consequence—namely, that musical instruments are adaptations of the labourer’s tools. “We know,” he says, “that labour rhythmically carried on has a musical quality, and since savages, having no appreciation of pitch or harmony,[102] value rhythm alone, it is only necessary to strengthen and purify the tone produced by the implement and to complicate the rhythm, in order to produce what is in their estimation high art. Naturally, to accomplish this the tools were differentiated; varying conditions, as they arose in their labours, became the occasion of further efforts for the perfecting of tone and timbre, and the art instinct, struggling for expression, first found it in such rude music. So originated musical instruments from these tools of manual labour, and it is a noteworthy fact that beaten instruments were the first to appear, and are to-day the favourites of savages. We find among them the drum, gong, and tam-tam, while with many tribes the only instrument is the kettledrum, which clearly proclaims its origin, being in many cases nothing more than a skin tightly stretched across the grain mortar or a suitable pot or kettle. Primitive stringed instruments also were struck, like the Greek pleptron, the tone of a violin and of the strings themselves being a later discovery. Wind instruments, too, are of very ancient origin, the commonest being the flute and reed pipe, both of which are rhythmic. The ancient Greeks used them first to mark time and as accompanying instruments.”[103]