E X. 



A. B. C. D. on a concise method of 

 determining tlie figure of a gravita- 

 ting body revolving round another, 

 208— On the direct attraction of a 

 spheroid, and demonstration of Clai- 

 raut's theorem, 273 



Accum, Mr. his apparatus for igniting 

 light combustible substances by means 

 of compressed air, 278 



Acetous acid, formation of, in cases of 

 indigestion, 196 



Alkalies, fixed, nature of, and their 

 decomposition by electricity, 290, 321 



Allen, Mr. 326 



Altitudes ; artificial portable horizon for 

 taking, 279 



Alum ore of Tolfa, analysis of, 359 



Amber varnish and acid, 227 



Ammonia, nature of, 324 



Analysis — of the water of the Dead Sea, 

 32 — Of the water of the river Jor- 

 dan, 38— Of jade, 104— Of yenite, 

 142— Of the schist that accompanies 

 the menelite near Paris, 155— Of 

 some varieties of steatite, or talc, 170 

 —Of diabetic urine, 232 — Of iron 

 spar, 314, 357— Of an urinary cal- 

 culus, 317 — Of alum ore, S59 



Anderson, Charles, Esq. on the geog- 

 nosy of the island of Inch Keith, in 

 the Frith of Forth, 238 



Animal heat, cause of, 200 



Apple-trees, culture of, 50 



Arc of the meridian m.easured in India, 

 <40 



Aremberg, Comte de, 57 



Arn'-'*'Vs pendulum spring, 225 



Aih.«trecs, improved method of raising, 

 354 



Asphaltite, lake, analysis of its water, 

 23 



Vot, XX, 



Aston, Mr. J. extract of a letter from, 

 giving an account of a mule cucum- 

 ber, and other objects, 2'.i!l 



Atmospheric phenomena, SI 



Atmosphere, lunar, 117 



AUraction, direct, of a spheroid, 273 



Attraction of the earth upon the atraos- 

 piiere of the moon, 1 17 



Aumont, Gillet, G4 



Aurora borealis, see Phenomena 



B. 



Bakerian lecture, 290, 321 



Balance level, for laying out land for 

 irrigation, &c. 344 



Balbo, M. on native gold dust, 268 



Banks, Sir J. on tho time when the 

 potato was first introduced into the 

 United Kingdom ; with some account 

 of the hill wheat of India, 1— On the 

 rumination of the kaiiguroo, 12— 

 On the lava of Mount Hecla, 182 



Bauhin, Caspar, on the tuberose, 58, 

 168 



Beilstein, a species of jade, 105 



Bell, Lieut. John, his accoinit of ex- 

 periments made to ascertain theprac- 

 ti(5ability of throwing a line to the 

 shore from a vessel stranded, 285 



Bellevue, M Fleuriau de, on volcanic 

 agency, 176, 241 



Beigman's analy.'-.is of iron spar, 314, 

 Qbl 



Berthiji, M. his analysis of iron spar, 

 314 



Berthollet, M. on native gold dust, 272 

 —His decomposition of ammonia by 

 electricity, 327 



Besson, M. 07 



Biggs, Mr. his account of some new 



apples, which, with many others that 



have been long cultivated, were exhi- 



b tiled 



