Observations on the climate in different parts of America, compared with the climate in corresponding parts of the other continent : to which are added, remarks on the different complexions of the human race ; with some account of the aborigines of America ; being an introductory discourse to the History of North-Carolina

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This work ranges from considerations of climate to a discussion of the nature and properties of heat, to speculations on the origins of man, specifically the American Indian. Williamson recorded much important data and deserves credit as a poineer in the fields fo climate and race.