Mostly for Greg
From Samuel Roberts's Infectious Fear, p. 44-45:
Basic comparative anatomy and recapitulation theory (the pre-Darwinian evolutionary idea that inferior races developed only to the childlike or adolescent level of superior races), explained a catalog of anatomical and physiological functions (including the lungs) in the Negro that had only attained the efficiency and development of a white child and thus rendered Negroes diathetically prone to racially specific diseases. Among these were Negro consumption and frambesia (also known as pian or yaws, which many physicians believed to be peculiar to blacks). Not as effectively illustrated by comparative anatomy but no less obvious were "drapetomania" (a mental disorder that caused slaves to run away from their masters) and "dysaesthesia aethiopis" (also known as "rascality," the prevalence of which among blacks was evidenced by "the history of the ruins and dilapidation of Hayti and every spot of earth [blacks] have ever had uncontrolled possession over").