THE CONTENTS CLASSED UNDER GENERAL HEADS. 



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

 Magnetics, Meteorology, Optics, Pneumatics. 



CPage 

 AMPANrS Improvement of Optic 



Glasses 2 



A Spot in Jupiter ; by Mr. Hook 3 



Motion of a Comet ; by M. Auzout 3 



Exper. History of Cold; by Mr. Boyle 4 



Pendulum Watches for the Longitude; by 



M. Holms 6 



Two Comets ; by J. D. Cassini 8 



On Cassini's Account of Comets; by Auzout 9 



On the Second Comet; by Auzout 14 



The Languadoc Canal ; by M. Petit 15 



Tides in the West of Scotland; by Sir R. 



Moray 20 



Apertures, &c. of Telescopes ; by Auzout, . 22 



Auzout on Hook's Grinding Optic Glasses. . 23 

 Illuminating and Burning by the Sun ; by 



Auzout ibid 



On Campani's Optic Glasses ; by Auzout. . 24 



Campani's Answer, and Auzout' s Reply. . 26 



Account of Villette's Burning Glass 34 



Optic Glasses and Telescopes ; by Hevelius, 



&c 36 



Grinding Parabolic Glasses ; by De Suns. . 41 



Changes in the Earth and Moon; by Auzout 43 



Trials of Campani's Optic Glasses 45 



Shadow of Jupiter's Satellites 51 



Jupiter's Rotation on his Axis 52 



Italian Academy, and Uleg Beig's Stars. . . . ibid 

 Hevelius's and Auzout's Observations on 



Comets 53 



Distance of the Sun and Moon from the 



Earth ibid 



An Observation of Saturn 54 



Barometers, and their Observations ; by Dr. 



Real ibid 



Barometrical Observations; by Dr. Wallis 60 



Rotation of Jupiter; by Hook and Cassini. . ibid 



Barometer Observations, &c.; by Mr. Boyle 62 



Observations on Mars; by Mr. Hook.... 65 



Refracting Rays of Light 3 by the same. ... 66 



Page 

 Jupiter's Spots ; and Optic Glasses of Cam- 



pani and Divini (Jg 



The Wheel Barometer; by Mr. Hook. ... 72 

 Mock Suns and Rainbows, observ. in France ibid 



Thunder at Oxford; by Dr. Wallis 74 



Descent of Bodies in Water 76 



Statical Baroscope ; by Mr. Boyle 77 



Rotation of Mars ; by Mr. Hook 80 



by M. Cassini 81 



Phases of Jupiter ; by Mr. Hook. . '. 83 



Observation of Saturn ; by the same 84 



Effects of Thunder, &c. ; by Thomas Neale, 



Esq ibid 



Artificial Cold without Snow, &c.; by 



Mr. Boyle 86 



On the Tides ; by Dr. Wallis 89 



Appendix to the same loi 



Solar Eclipse, June 22, 1666 11 1 



Inquiries about Tides ; by Dr. Wallis 112 



by Sir R. Moray. ... 113 



Tables for obser\"ing Tides ; by the same. . lis 



Inquiries about the Sea ibid 



Optic Glasses of Rock Crj'stal; by Divini 134 



Calculat. of a Solar Eclipse; by Plevelius. . 137 



New Star in Cygnus; by the same ibid 



To measure the Planets Diam. ; by Auzout 138 



To observ^e Lunar Eclipses ; by Mr. Rooke 145 



Halos about the Moon; by Earl Sandwich 146 



Loadstone in. Devonshire; by Dr. Cotton.. 149 

 Loadstones and Sea Compasses; by Mr. 



Oldenburg ibid 



Effects of the Air-pump on Plants, &c, ; by 



Dr. Beale 150 



On Gascoigne's Micrometer ; by Mr. Townley 161 

 Nebulosa in Andromeda, and Star in Collo 



Ceti ; by Bulliald 1^2 



Magnetical Experiments ; by Mr. Sellers. . 166 



Large Hailstones ; by Dr. Fairfax i6"8 



Magnetic Experiments; by Mr. Colepress. . 177 



Magnetic Variations j by Mr, Petit 137 



