XIV 



CONTENTS. 



Page 



Descr. Gascoigne's Micrometer; by Hook 195 

 Tides, Wells, Whale-fishing, &c.j by Mr. 



Norwood 206 



Spots seen in Venus ; by Cassini 217 



Grinding Optic Glasses; by Mr. Smethwick 22() 

 Tides at Plymoutli ; by Mr. Colepress. . . . ibid 



Variety in Tides .; by Dr. Wallis 238 



Tides at London ; by Mr. Phillips 239 



Marriotte on Vision ; by Mr. Justcl 243 



Answer to ditto ; by M. Pecquet 245 



Comet in March 1668 250 



Controversy between Angells and Riccioli 254 

 Magnetic Variations and Tides; by Capt. 



Sturmy 265 



Easy Help for Decayed Sight 266 



Gregory's Answer to Huygens 268 



Picture on a Wall in a Room ; by Hook. . 269 



Note to the Help for Decayed Sight 275 



Magnetic Variations; by H. Bond 282 



Polishing Telescopic Glasses 284 



Tides near Bristol; by Capt. Sturmy 29O 



Working Spherical Glasses ; by Manecini. . 298 



New Microscope ; by Divini 301 



Boyle's Physico-Mechanical Experiments. . 303 

 Saturn observed; by Huygens and Picard. . 326 

 Huygens's Pendulum Watches for the 



Longitude 343 



Two Parhelia seen by Dr. Edward Brown, . 349 

 Grinding Optic Glasses; by Dr. Wren. . . , 353 

 Villette's Metalline Burning Concave. . . . 367 

 Weight of Water in Water ; by Mr. Boyle 374 

 On Voyages to the East Indies ; by Mr. 



Smithson 375 



Wren's Engine for Grinding Glasses 396 



Celestial Phaenomena; by Mr. Flamsteed. . 414 

 Baroscope and Thermoscope ; by Dr. Beal 415 



. by Dr. Wallis 4l6 



Languedoc Canal ; by M. Riquet 418 



Cassini's Method for Apogees, &c. ; by 



Mercator 424 



Magnetic Variations at Rome; by Auzout 434 

 Principal Organ of Sight ; by Mariotte. . . . 443 



Halos, Parhelias, &c. ; by Huygens 457 



Experiments of Respiration ; by Boyle. . . . 473 



Continuation of Ditto 49O 



Magnetic Variations ; by Hevelius 514 



On Wallis's Tides; by Mr. Childrey 5l6 



Dr. Wallis's Answer to ditto 520 



Effects of Thunder at Stralsund 526 



New Star and Saturn's Ring ; by Hevelius 528 



On the same New Star, from Paris 530 



On Saturn's Ring ; by Huygens and Hook ibid 

 Artificial Conglaciation at Florence 540 



Page 



Lunar Eel. and Conjunct, of ? and J ; by 



Hevelius 542 



On Spots in the Sun ; by Mr. Hook 548 



On a Solar Eclipse ; by the same ibid 



On Colours and Dyes; by Mr. Lister 582 



Irregular Tides of the Euripus; byj. P. Babin 592 

 New Star near the Beak of Cygnus; by 



Hevelius 60/ 



Account of the same from France 6O8 



Intimation of some Philosophical particulars 6IS 

 On the Hypothesis Physica nova of Leibnitz; 



by Dr. Wallis 6I8 



Compression of the Air under Water 622 



Spots in the Sun observed at Paris 631 



On a Lunar Eclipse, Sept. 8, I671 63Cf 



Lunae ad fixas Appulsus ; a J. Flamstedio. . 649 



Solar Spots observed at Paris 656 



Saturn observed at Paris 657 



Solar Spots and a Lunar Eclipse; by Dr. 



Fogel 659 



Appearances of Saturn ; by Mr. Flamsteed 66O 

 On the Speaking Trumpet ; by Sir S. More- 

 land 670 



On the Lyon's Burning Concave, and an odd 



Salt 672 



The Pleiades observed in 1671 ; by Mr. J. 



Flamsteed 673 



New Theory of Light and Colours ; by Mr. 



Isaac Newton 678 



New Catadioptrical Telescope ; by Mr. J. 



Newton 691 



Remarks on the same ; by M. Huygens . . 694 



by Mr. Newton 695 



A New Comet; by Mr, Hevelius 696 



On the New Telescope, with Apertures and 



Charges ; by Mr. Newton 703 



Answer to Objections to his Telescope ; by 



Mr. Newton 705 



Observationes Jovis ad duas fixas, by J. 



Flamsteed 706 



Spot and Rotation of Jupiter; by S. Cassini 708 

 Considerations on Berce's Remarks on the 



New Telescope; by Mr. Newton 711 



Experiments proposed by Mr. Newton, on 



his Theory of Light and Colours 714 



Objections against Mr. Newton's Theory of 



tlie same ; by Mr. F. Pardies 726 



Mr. Newton's Answer to the same 730 



Queries on his Theory of Light and Colours ; 



by Mr. Newton 734 



A Second Letter on tlie same; by M. 



Pardies 738 



Answer to the same ; by New^ton 740 



