Lectures and collections made by Robert Hooke ... Cometa, containing observations of the Comet in April, 1677 ... Mr. Boyle's observation made on two new phosphori ... Microscopium, containing Mr. Leeuwenhoeck's two letters ... The author's discourse and description of microscopes, improved for discerning the nature and texture of bodies. P. Cherubine's accusations answered. Mr. Young's letter containing several anatomical observations