They quickened the old life within him, and the old tricks which they had stamped into the heredity of the breed were his tricks.
Far more potent were the memories of his heredity that gave things he had never seen before a seeming familiarity; the instincts (which were but the memories of his ancestors become habits) which had lapsed in later days, and still later, in him, quickened and become alive again.
There are no more uses of "hereditary" in the book.
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It is hereditary, but fortunately not contagious.
It is an unfortunate hereditary condition that is not easily detected even by the regular and thorough cardiac screening.