A Letter Written to the Most Reverend Father D. Cla. Fremond Calmad, Publick Professor in the University of Pisa, Giving an Account of the Earthquakes Felt in Leghorn, from the 16th to the 27th of January 1742. With Some Observations Made by the Most Reverend Sig. Pasqual R. Pedini, Principal of the Clergy of the Most Eminent College of the Said City. Communicated to the Royal Society by James Jurin, M. D. F. R. S. &c.