The author's defence against a charge that he plagiarized Dr. Bryan Higgins' experiments on air. It includes the correspondence with his accusers, Dr. Higgins and Dr. Richard Brocklesby, between Nov. 30 and Dec. 9, 1775.
"Errata": p. 
"A catalogue of books written by Joseph Priestley ... and printed for J. Johnson": p. [89-92]
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