?€œAn Experimental Inquiry Into The Properties Of Opium And Its Effects On Living Subjects?€ by John Leigh, M.D., offers a fascinating glimpse into the early scientific investigation of opium. This volume, which won the Harveian Prize in 1785, details Leigh's meticulous experiments and observations on the effects of opium, providing a valuable historical record of medical practices and understandings of the late 18th century.