Bonar sold the 3rd through 5th editions of the Britannica, and produced the supplement to the 3rd edition Bonar held the copyright for that supplement, for whose material he asked great sums (20,000 pounds sterling) in subsequent editions, although he was granted but little (100-200 pounds). Bonar was friendly to the article authors, and introduced the policy of paying them as well as the article reviewers, and of allowing them to retain copyright for separate publication of their work.
Bonar quarreled with his father-in-law, Andrew Bell, and the two men did not speak from 1799 to 1809, when Bell died. Bell's successor, Archibald Constable, wisely bought out Bonar's copyright for the 5th edition and kept him as an ally of the Britannica.
- The Great EB by Herman Kogan, University of Chicago Press, 1958, p. 28. Note in this reference his name is spelled Thomson Bonar
- His name is clearly spelled Thomson Bonar, not Thomas, in the frontispage of the supplements to the 3rd edition of Britannica, 1803, Encyclopædia Britannica.
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