I shall leave you to trace the natural origin of the following words, and think how much of man’s spoken language is taken from common sounds. Thus we have roar, shriek, whistle, hiss, sigh, sing, ring, thump, bump, clash, clang, bang, twang, clap, smack, slap, smash, swish, swirl, gong, thong, boom, bellow, batter, chatter, clatter, snap, snip, whip, gurgle, shiver, quiver, rumble, roll, rattle, prattle, and a hundred more. Words thus derived from familiar sounds abound in all languages, and they, no doubt, are the easy steps by which men climbed to a more complicated speech. The earliest men must have been obliged to pay great attention to animals and birds, which have voices of their own; for to hunt and catch them was the principal occupation of their lives; therefore, when speaking of them to one another, they would naturally call them by names resembling the sounds they made. Our verbs “to squeak” and “to squeal” are certainly taken from the cries of animals when in pain; but I have said enough to show you how language grew up among pre-historic people. We do not know for certain that they had any musical instruments, but they would hear the sighing of the wind among the trees, and it would almost certainly be found out that blowing down a hollow stick or reed, open at one end and closed at the other, would make a whistle; but if they used any of these things they would not last like the stone tools, and have decayed away; and we do know that they had begun to draw upon such imperishable materials as bone and slate.