INDEX,

Anemescope, Description of, ii. 2x1 n. Measures theForce of the Wind, ibid.

Angle under which the Earth’s Semidiameter appears,at the Sun determined, ii. 109 n.

Angle of Incidence , fee Incidence.

' Anomaly equated or true, how found, from the Mean,iii. 161 n.

Antardlic Circle what, iii. 176.

Antipodes who, iii. 282.

Antœci who, ibid.

Aphelion , what, ii. 102. Fprce of the Sun on the Wa-ters less in, ibid. Possesses different Points in theOrbits of the Planets, iii. 144 n.

Apsides , Line of always in the fame Position, ibid.

Arch diurnal, or Length of the Day, by what repre-sented, iii. 177. Nocturnal, or Length of theNight, iii. 179.

Archimedes’’s Screw for raising Water, ii. 66 n. Sphere,the first Orrery and what, iii. 165 n. Mentioned byCicero, ibid. Method of discovering the Fraud inHier0 ’s Crown, i. sis seq.

Argonautic Expedition, what, iii. 248. Æra of settled,by Sir Isaac Newton, iii. 249 & seq.

Artificial Magnets, how to make them, i. 75. Append,to Lect. I.

Ascension right, what, iii. 256. Oblique, what, ibid.

Ascensional Difierence, what, iii. 356.

Astronomical Principle of Chronology by Sir Isaac New-ton, iii. 248. .

Atlantic Ocean, the Theory of the Tides verified in,ii. 96,

Atmosphere, Electricity of how observed in Winter,' i,73. Height of how determined by Observations andExperiments, ii. 141. Whole, its Weight on theEarth investigated, ii- 151 n. Affected by Attrac-tion of heavenly Bodies, 206. What Effect it hason the Wind, ibid. Of Matter what, i. 12.

Attradlion or Gravity, i. 13. Originally commu-nicated by God to aid Matter, ibid. Manner inwhich exerted and the Means by which propagatedunknown, ibid.. The Propagation of its Virtue

accounted