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Besides, all attempts at differentiating an ape-unit into anything else than an ape-unit would be as impossible as to multiply or divide cabbages by turnips, or sparrows by sparrowhawks. Such divisions would give us no quotients, any more than their differentiations would give us a coA"fficient.
When, therefore, we attempt to extend the formulA| of differentiation to plant and animal life, we are confronted by a very formidable difficulty at the outset the impossibility of determining an invariable coA"fficient for any two variables.
The actual coA"fficient sought is the difference effected, in functional value, in one of two independent variables. For all formulA| in differentiation are constructed on the hypothesis that only one of two variables suffers change. The differential coA"fficient has yet to be determined which shall express the developmental changes in two variables at once.
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