Both were popular for decades, and the trustees of Warrington were so impressed with Priestley's lectures and charts that they arranged for the University of Edinburgh to grant him a Doctor of Law degree in 1764.
Kedua buku tersebut populer selama beberapa dekade, dan wali amanat Warrington sangat terkesan dengan ceramah dan karya Priestley tersebut sehingga mereka mengatur agar Universitas Edinburgh memberikannya gelar Doktor Hukum pada tahun 1764.