Biology. An inquiry into the cause of natural death : showing it not to arise from old age, but from a gradual process of consolidation, arising from substances which may be so far controlled as to preserve health and active life for an indefinable period / By Tryon [pseud].

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Biology. An inquiry into the cause of natural death : showing it not to arise from old age, but from a gradual process of consolidation, arising from substances which may be so far controlled as to preserve health and active life for an indefinable period / By Tryon [pseud]. Public Domain Mark. Source: Wellcome Collection.