Two essays : one upon single vision with two eyes ; the other on dew : a letter to the Right Hon. Lloyd, Lord Kenyon, and an account of a female of the white race of mankind, part of whose skin resembled that of a negro ; with some observations on the causes of the differences in colour and form between the white and negro races of men / by the late William Charles Wells, with a memoir of his life, written by himself.

Two essays : one upon single vision with two eyes ; the other on dew : a letter to the Right Hon. Lloyd, Lord Kenyon, and an account of a female of the white race of mankind, part of whose skin resembled that of a negro ; with some observations on the causes of the differences in colour and form between the white and negro races of men / by the late William Charles Wells, with a memoir of his life, written by himself. Credit: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.. Public Domain Mark