tl CONTENTS. 



Page Pag* 



A new Comet seen at Leipsic, Sept. l6s6, . . . 346' Transit of Mercuryj Wurtzalbaur 435 



An OccHltation of Saturn, Haines 350 Conjunct, of the Sun and Planets, Halley . . . 448 



On Saturn's Satellites, Cassini 363 Treatise of Navigation, Sir Wm. Petty 511 



Apparent Magnitude of the Sun, Molyneux. . 365 Parallax of the Fixed Stars, W.nllis 562 



On the same Subject, by Dr. Wallis 369 On a Solar Eclipse, Gulielmini 569 



Measure of a Degree 390 Albateni's Astron. Tables, &c, Halley 586 



Obliquity of the Ecliptic 407 Distance of the Stars, Roberts 632 



Tabulae Astron. De la Hire 419 Tables of Jupiter's 1st Satellite, Cassini 673 



Eclipse of the Moon observed at Moscow .... 42 1 



4. Projectiles. 



On the Force of Great Guns, Greaves 192 On a Problem in Gunnery, &c. Halley 261 



5. Mechanics. 



Advantages of High Wheels 1 14 De Mensuris et Ponder. Bernard 241 



CoUeg. Experiment, pars 2da, Sturm saa On the Perpetual Motion, Papin 315 



On the Perpetual Motion, Papin 240 On the same, Papin 349 



6. Hydrostatics. 



Bodies floating in lighter Fluids 295 Pressure of Water at Great Depths 444 



Propositiones Hy drostaticae, Jessop 418 Expansion of Fluids, &c. Halley 505 



Medicina Hydrostatica, Boyle 437 On the Pressure of Water, &c 583 



7. Hydraulics. 



De Aquis et Aquad. Vet. Romae 5 On the same subject, by R. A , 239 



On the Wurtemburg Siphon, Davis Ill On the same, by W. Tenon 244 



On a new Siphon, Papin •'. 1 12 On the Wurtemburg Siphon, Reisel 249 



On the Versailles Aqueduct l67 Papin, on his Water Engine ibid 



New way of Raising Water, Papin ........ 193 Mouvement des Eaux, Mariotte 308 



Aqueduct near Versailles 231 Papin, on his Water Engine 348 



On Papin's way to Raise Water, Vincent. . . . 239 



8. Pneumatics. 



Exper. Acad, del Cimento, Waller 87 Height of Barometer, &c. Halley 300 



On the Barometer, Dr. Lister 95 Velocity of Air in a Vacuum, Papin 334 



On the Barometer and Weather, Garden .... 157 Divisions of the Barometer, Hook 343 



On the Air's Gravity, Wallis , , i62 On Gunpowder, &c. Leuwenboeck 537 



Shooting by Rarefaction of Air, Papin 273 



9. Acoustics. 



On Sounds, by the Bishop of Ferns 5 Treatise on Harmony, Holder ............ 624 



On the Trumpet and Trump. -Mar. Roberts. . 467 



10. Optics. 



On the Aerial Telescope, Huygens 64 Extraordinary burning Speculum 385 



On Telescopic Glasses, Molyneux 329 Theory for the Foci of Lenses, Halley 593 



Sciotericum Telescopicum, Molyneux 336 On Light, and Diaphoneus Bodies 6OO 



11. Magnetism. 



Magnetic Variation, &c. Heathcot 32 Magnetical Experiments, De la Hire 381 



Magnetism of Perpendicular Iron, Bayly. . . . 232 Magnetical Variations, &c. Halley 470 



Magnet. Variat. at Nuremberg, Einaart 244 On Magnetism, by J. C 67* 



