INDEX. 



Aberration of the stars, an easy method of computing, 151-154 

 — of compound lenses and object-glasses, 369 



Abo, notice of the observatory at, 432 



Acceleration of the pendulum in different latitudes, notice of 

 experiments for determining, 363-367 



Aerolite, fall of, at Juvinas, account of, 425-426 



Air rendered heavier by the separation of its lighter parts, 54- 

 56 — thickened by fire, 61-64— proof that it diminishes in 

 weight, 294, 295 



Air-pump, successful application of, to the impregnatmg of 

 substances with fluids, 168 



Allan's dividing-engine, specimens of examination of, 385, 386 

 results of his measures, 388 



Alcaline minerals, analysis of, 169-171 



Alloys of steel, experiments on different, 316-318 



Alu7n found in decomposed mica-slate, 414 



Alum-slate of Freienwald, analysis of, 278-282 



Alum-sto7ie of Tolfa, analysis of, 277, 278 



America, census of, 432 



Amici(Proi.) account of some optical inventions by, 398-401 



Analyses (chemical) of ferro-arsenical sulphuret of copper, 30- 

 32 — of an antimonial sulphuret of copper, 32-34 — of a cu- 

 preous sulphuret of lead and antimony, 34-36 — of the sul- 

 phuret of copper and bismuth, 36-37 — of the blue iron ore of 

 Eckartsberg, 38 — of granular chromic iron ore, 39, 40 — of 

 alcaline minerals, 169-171— table of their results, 328— of 

 black and green tea, 201-206— of cererit, or cerite, 262-264 

 — of the oxide of cerium, 264, 265 — of a compact ore of Ti- 

 tanium from Arendal, 265, 266— of the topaz, 266 — ^jiarticu- 

 larly that of Saxony, 266-268— of zoisit from Carinthia, 268, 

 269— of the foliated augite of Carinthia, 269, 270— of con- 

 choidal apatite, 271, 272 — of the columnar brown spar of 

 Mexico, 272-274 — of dolomite, 274— of anhydrite, 275 — of 

 bitter spar from the Tyrol, 276 — of the Green earth of Verona, 

 276— of the alum-stone of Tolfa, 277 — and of Freienwald, 

 278-282 — of the crystallized calamine of Limbourg, 328 — of 

 an arsenical pyrites, 328 — of the garnet of Broddbo, 329 — of 

 malacolite, 329— of meteoric stones, 329-331 — of chondro- 

 dite, 329 — of copper pyrites, 331 



Anhydrilc, analysis of, 275-276 



