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VARIATION AND ‘]5ÏFFERENTIATION
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1908). The curve of the variations has been ' drawn by
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It Will be noted, that the observed frequencies arrange
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themselves very evenly above and «'beloW
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decreasing gradually to 1 at »110 vertebræ and to 41àtf _; 19
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vertebræ. '
This arrangement of the
average, though. not always so regular as in the
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Bel, is a well—marked feature in the variation of shes: fT°
use Heineke’5 Comparison, it is as if the Variable forces Were
always airin'g at a target,
”average in the. centre., -
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The frequencies are expressed as
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