THE CONTENTS CLASSED UNDER GENERAL HEADS. 



Natural Philosophy — Acoustics, Astronomy, Hydraulics, Hydrostatics, Hydrology, 

 Magnetics, Meteorology, Optics, Pneumatics. 



HPage 

 EIGHT of Merc, in a Tube ; by Huygens 1 



Astronomical Observations j by Flamsteed 5 



On the Lake of Geneva 6 



Newton's Answer to Objections, &c 13 



Flamsteed, on the planet Mars, &c 34 



Boyle, on the varying Weight of the Atmos. 42 



Wallis, on the great Height of Barometer 44 



Two new Satellites of Saturn ; by Cassini . . 50 



Flamsteed, on the planet Jupiter 65 



Magnetical Variations j by H. Bond 78 



Against Newton's Doctrine of Colours .... 85 



Newton's Answer to the same 86 



Effects of Thunder on Corn ; by Kirkeley 89 



Flamsteed, on Mars and Jupiter 90 



Boyle, on Effluviums, Fire, Flame, &c. ... 91 



Newton, on the Num. andMixt. of Colours ibid 



Answer to the same, from Paris 94 



Huygens and Sluse, on Alhazen's Problem 97 



— — — — on the same 107 



Compression of the Air; by Leuwenhoeck 128 



On raising Water; by Sir S. Moreland 129 



On Parheliasj by M. Hevelius 130 



On Kepler's Manuscripts ibid 



On a new Astronom. Chronol.j by Hevelius 134 



Huygens, on the Earth's Motion 135 



Cassini, on the same ibid 



On a Comet at Brasil; by Estancel ibid 



Linus against Newton on Colours 175 



Newton's Answer to the same 176 



Flamsteed, on Street's Moon-wiser 177 



- — on New Solar Numbers 178 



Lunar Eclipse; by Flamsteed, Hook, &c. . 187 



— by Cassini, Picard, &c. . . . 193 



The Earth's Meridian; by Picard ibid 



Lunar Eclipse and Occultation; by Hevelius 205 



A Storm, and some Lakes ; Sir G. Mackenzie 210 



New Essay Instrument ; by Boyle 214 



Frosts, Tempests, &c. ; by Dr. Beale 220 



Horrox's Lunar System; by Flamsteed .... ibid 



Lunar Eclipse observed by Flamsteed 221 



Linus, on the Rainbow r. . . 222 



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Lunar Eclipse observed at Paris 223 



Flamsteed, on the First Meridian 236 



Pneumatic Exper. ; by Huygens and Papin 239 



Origin of Fountains; by Denys Papin .... 242 



Experiments on Air; by Mr. Boyle 246 



Pneumatic Exper. ; by Huygens and Papin 255 



— — — — by the same 257 



Lunar Eclipse observed by Flamsteed .... 259 



Linus against Newton on Light 260 



Newton's Reply to the same 26l 



■ another on the same 263 



Pneumatic Exper.; by Huygens and Papin 271 



The same continued 272 



Another Answer to Linus ; by Newton .... 276 



Lunar Eclipse; by Cassini 280 



Transit of the Moon and Jup. ; by Flamsteed 281 



Lunar Eclipse observed by Hevelius 288 



A Degree of a great Circle, &c 305 



Solar Eclipse observed by Smethwick, &c. . 306 



Effects of Thunder on Sea Compasses, &c. . 309 



Solar Eclipse observed by Hevelius 3l6 



On a Solar Eclipse; by Flamsteed ibid 



The same Eclipse: by Mr. Townly 318 



Also by Immanuel, Cassini, Hevelius .... 319 



Hydraulic Engine from Paris 323 



Cassini, on Jupiter's Satellites 324 



Halley, on the Aphelia, &c. of Planets 326 



Flamsteed, on the Solar Spots 331 



Cassini, on a Solar Spot and Saturn 332 



Borelli, on large Telescope-glasses 333 



Lucas against Newton's Experiments 334 



Newton's Answer to Lucas 338 



A new Hygroscope; by Mr. Coniers 346 



Occultation of Mars ; by Hevelius 349 



The same; by Flamsteed and Halley 350 



Boyle, on the Figures of Contiguous Fluids 362 



The same continued 370 



Two Satellites of Saturn; by Cassini 377 



Trembling of Consonant Strings; by Wallis 380 



On New Stars; by Hevelius '. 384 



An uncommon Meteor; by Wallis 389 



