Lectures and collections made by Robert Hooke, secretary of the Royal Society. Cometa. Containing observations of the comet in April, 1677. Fragments of several lectures about those of 1664. and 1665. Sir Chr. Wren’s hypothesis and geometrical problem about those comets, a discourse concerning the comet of 1677. Mr. Boyle’s observation made on two new phosphori of Mr. Baldwin, and Mr. Craft. Mr. Gallet’s letter to Mr. Cassini, together with his observation of [Mercury] sub [Sun]. Mr. Cassini’ reflections upon those of Gassendus, and Hevelius, and upon this. Mr. Hally’s letter and observation of the same made at St. Hellena. Mr. Cassini’s observation of the diurnal motion of [Jupiter], and other changes happening in it. Microscopium. Containing Mr. Leeuwenhoeck’s two letters concerning some late microscopical discoveries. 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 ana
