'A dissertation on royal societies. In three letters from a nobleman on his travels, to a person of distinction in Sclavonia, containing an account of an assembly of a Royal Academy of Sciences at Paris, a description of a meeting of a Royal Society in London, and a coffee house conversation.' With explanatory notes. The third letter signed H.L.Z. [by John Hull M.D.]. Printed for John Doughty, near St. Paul's, London. 1750