Gray fu l'autore di The Natural Arrangement of British Plants (1821). Fu padre di due zoologi, John Edward Gray e George Robert Gray.
Opere A supplement to the pharmacopoeias (Underwoods, Longman & Rees, Londres, 1818-1847). A natural arrangement of British plant. (Baldwin, Cradock & Joy, Londres, 1821) The elements of pharmacy and of the chemical history of the materia medica (Londres, 1823). The operative chemist (Hurst & Chance, Londres, 1828-1831). Traité pratique de chimie appliquée aux arts et manufactures, à l'hygiène et à l'économie domestique (Anselin, Paris 1828-1829). The chemistry of the arts (Carey & Lea, Philadelphie, 1830).
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