Another of Rush's medical views that now draws criticism is his analysis of race. In reviewing the case of Henry Moss, a slave who lost his dark skin color (probably through vitiligo), Rush characterized being black as a hereditary and curable skin disease. Rush wrote that "Whites should not tyrannize over , for their disease should entitle them to a double portion of humanity. However, by the same token, whites should not intermarry with them, for this would tend to infect posterity with the 'disorder'... attempts must be made to cure the disease."