This is an account of the career of James Dinwiddie (1746–1815). First published in 1868 by Dinwiddie's grandson William Jardine Proudfoot, the work is based on Dinwiddie's own autobiographical notes, travel logbook and personal correspondence. The biography traces Dinwiddie's career from the scientific lectures he gave from 1781 and the journal series Queries and Hints, which he began in 1779, to his visit to the Chinese imperial court as official astronomer in Lord Macartney's mission (1792–1794); his residence in Beijing and Canton; and his move to India, where he was appointed Professor of Mathematics, Natural Philosophy and Chemistry at the College of Fort William, Bengal. Dinwiddie's career was marked by passionate commitment to the dissemination of scientific knowledge – his travels, lectures and publications were undertaken for this cause. His life is a fascinating account of a polymathic mind which will fascinate and entertain a modern-day readership.