Circular letter prospectus for a periodical publication, Observations sur la physique, sur l'histoire naturelle et sur les arts (more commonly known as Rozier's Journal) for which François Rozier had purchased the publishing privilege in 1771. In 1773, the year this letter was published, Rozier changed the journal's format and began vigorously promoting his publication as an alternative to the slow, restricted-access publications of learned societies. Includes autograph signature of Rozier and one page manuscript letter indicating that communications to be considered for publication may be received by Benjamin Franklin, Mr. Magalhaens [John Hyacinth de Magellan?], and Mr. [Peter] Elmsley, bookseller, all three residing in London.
