292 Index. 



Alembic, form and use of the, ii. 1 10. 



Almacanthers, what, i. 267. 



Alkalies, simple substances in chemistry, ii. 36 chemical 

 account of them, 54 their natures, kinds, and pro- 

 perties, 140. 146 to 235. 



Alkaline salt met with in water, ii. 25g found in mineral 

 waters, 265. 



Alloys, nature of, ii. 24g. 



Altitude, what, i. 267. 



Alumina, or alum, chemical account of it, considered as 

 one of the kinds of earths, ii. 182 to 186. 



Ammonia, its nature and qualities, ii. 55. 144, 145. 



Amphiscii, why so called, i. 66. 



Amplitude, explanation of this term, i. 267. 



Analysis, great progress which has been made in this ope- 

 ration by modern chemists, ii. 101,102. 



Angle of incidence defined, i. 144. 



Angular distance, what, i. 266. 



Animal acids considered, ii. 166, 167. 



Animal substances, different classes of them, ii. 286 to 

 2pO. 



Animals, the component parts of, ii. 2QO- 



Annular eclipses of the sun, when take place, ii. 22. 



Antipodes, explanation of this term, i. 266. 



Antoecii, the, i. 266. 



Apparatus, chemical, lecture on, ii. 104 advantages and 

 disadvantages of vessels made of different materials, ib. 

 forms of vessels for different purposes, 107 means of 

 producing heat, 111 constructions and objects of 

 furnaces, 117 lutes, 123 a large apparatus seldom re- 

 quired, 124. 



Armillary sphere, the, defined, i. 268. 



Artificial day, meaning of the term, ii. 9. 



Asbestos, nature of the, ii. 194. 



Ascension, right and oblique, and ascensional difference 

 explained, i. 267. 



Assaying metals, process of, ii. 242. 



Astronomy, lectures on, i. 250. 270. ii. 1. See Eclipses, 

 Seasons, Solar System, and Time. Origin and dignky 

 of this science, i. 250 its history, 251 explanation of 

 the principal words and phrases used in it, ^63. 



Atmosphere, experiments to prove the weight and pressure 

 of the, i. 65,66 lecture on the phsenomena of, 78 in- 

 quiry concerning its height, ib. height of how calcu- 



