MATTERS GERMANE TO TESTING
Before I deal with the true substance matter of this paper, there are a few points to which I would direct attention, and foremost is that most interesting phenomenon of nature—sound. Not only is every human voice different; as an external configuration, family characteristics occur, so often in voice the same applies. One can tell by sound what variety of musical instrument is being played, and frequently distinguish the up from the down stroke note on a violin. In this instance there is a variation in the timbre of a note, due to a physical alteration in the string from which the sound is produced. The string is of twisted gut, the up stroke going in the direction of the twist tends to tighten the string, the down stroke on the other hand, tends to loosen or undo the twist. But the difference in the