What was life? No one knew. No one knew the actual point whence it sprang, where it kindled itself. Nothing in the domain of life seemed uncausated, or insufficiently causated, from that point on; but life itself seemed without antecedent. If there was anything that might be said about it, it was this: it must be so highly developed, structurally, that nothing even distantly related to it was present in the inorganic world. Between the protean amœba and the vertebrate the difference was slight, unessential, as compared to that between the simplest living organism and that nature which did not
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