In the history of many a great man, we are told that he had a peculiar aversion to some special thing, be this a cat or a rooster, or a flower or some perfume. In some cases of reconvalescence, we find special aversion to smoke, even in persons who have been addicted to smoking. Such aversions may be temporary or constant. If the aversion is temporary, we should call it a disposition in consequence of some disturbance in individuality; but if it is constant we may call it a peculiar constitution of individuality, in consequence of which particular agents operate on the individual in a manner different from their ordinary mode of action on persons in general; briefly, we may call it an idiosyncrasy. Even animals are reported to have idiosyncrasies, thus the horse to the camel.
Idiosyncrasies are not uncommon; they occur in regard to various agents. Perhaps the
BERNHEIM A. IDIOSYNCRASY AS TO MERCURY.A CASE OF ERYTHEMA MERCURIALE.. JAMA. 1901;XXXVI(4):253–254. doi:10.1001/jama.1901.52470040031001k
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