In 1795 and 1796, appeared the two volumes of Zoonomia, or Laws of Organic Life, the produce of long labour and much consideration.

His chief poetic works were the "Botanic Garden" and the "Zoonomia; or, The Laws of Organic Life," deemed, in the philosophy of them, not unworthy of criticism by such sane thinkers as Paley and Dugald Stewart (1731-1802).