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Parergon, pa-rėr′gon, n. a by-work, any work subsidiary to another.

One characteristic example of this by-work must suffice.

Like scholars, in addition to her professional or livelihood-study, she devotes herself to an extra-study and by-work and does, in connection with every piece of work, those that lie adjacent to it.

This however was no mere by-work.

These, and a hundred other similar instances, were all carefully considered and described by the great naturalist as the by-work with which he filled up one of the intervals between his greater and more comprehensive treatises.