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And the general belief, that varieties are distinguished from true species by their repeated reversion and that even such reversibility is the real distinction of a variety, would not hold. For this reason I have taken much trouble in ascertaining the circumstances which attend this form of atavism.
It is true that certain mathematicians warn us that a mechanics can be devised in which reversibility would no longer be the rule, but the bold attempts made in this direction are not wholly satisfactory.
So also, if I happen to enjoy counting, or to find the constancy of numbers sublime, and the reversibility of the processes connecting them consoling, in contrast to the irrevocable flux of living things, all this is due to my idiosyncrasy. It is no part of the essence of numbers to be congenial to me; but it has perhaps become a part of my genius to have affinity to them.
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