Index. 305 



Monsoons, theory of the, i. 86. 



Month, its period, ii. 14 difference between a periodical 

 and a synodical month, i. 3l6. 



Monn, method of ascertaining her horizontal parallax, i. 

 2gQ. 298 her diameter and bulk, 312 period of her 

 revolution round the earth, 313 explanation of her 

 phases, quarters, &c., 313, 314 difference between 

 her periodical and her synodical revolution, 316 her 

 revolution on her own axis, 317 her libration ex- 

 plained, ib. her year, 'ib. phenomenon of the har- 

 vest moon accounted for, 318 explanation of her 

 nodes, 322 appearance of her surface when viewed 

 through a telescope, 324 her mean distance from the 

 earth," 32? her eclipses, ii. 18 to 22 her influence 

 on the tides, lecture xii. 343. 



Motion, lecture on the laws of, i. 216 principles of gra- 

 vitation, and the vis inertias of matter explained and 

 illustrated, ?l6, $-17 great specific laws of motion, 

 and illustrations of them, 221, 222. 227 account of 

 the centre of gravity, 228. 



Mountains, why the highest parts of are the coldest, ii. 

 65. 



Muriat of soda, or common salt, ii. 54. 



Muriates found in waters, ii. 260. 



Muriatic acid, nature and properties of, ii. 154. 15? how 

 discoverable in water, ii 270. 



Muriatic radical, a simple substance in chemistry, ii. 36 

 chemical account of this, 46. 



N. 



Nautical almanac, use of the, in determining the longi- 

 tude, i. 340. 



New style, when introduced, ii. 17. 



Newton, discoveries oF, i. 9. 



Nitrat of silver, curious experiment with a small grain of, 

 ii. 97 what composed of, ib. 



.Nitric acid, experiment with on ice, ii. 74 nature and 

 properties of, 147, 148. 154. 156 -one of the freezing 

 mixtures, 156. 



Nitrogen or azote, a simple substance in chemistry, ii. 36 

 chemical account of, 46. 



