Practically we see the significance of these differences. No
manufacturer thinks of making one size of overall in the hope that it
will fit each of these men. He adapts his garment to their size, and he
knows approximately how many of each size will be called for in the
course of ordinary business.
If these same men could be taken one by one into a music studio and have
their voices tested for range, the same interesting variations would be
found. There would be a few very high tenors, a few exceptionally low
bassos, and a crowd with medium range with fillers-in all along the
line.
If we were interested in carrying the experiment still further we might
apply the speed test. In a 100-yard dash a few men would be found to be
particularly fast, a few others would trail away behind at a snail's
pace, while the big crowd of men would make the distance in "average
time."
Of course, it would be foolish to attempt to make tenors of all these
men--equally foolish to try to make speeders of them all. In these
practical matters we appreciate the wisdom of letting each man fit into
that niche for which he is qualified.
Nor are these differences confined to the field of physical
characteristics and achievements. Tests by the hundred have demonstrated
beyond all question that they hold equally well of mental capabilities.
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