419 



magnetized needles, towards iron, ii. 

 347 ; on magnetic influence in the 

 solar rays, ii. 351. 



Chromium, on some of the compounds 

 of, ii. 313. 



Chronometers : on the errors in longi- 

 tude, as determined by, ii. 130; on 

 the effects produced in the rates of 

 by the proximity of iron, ii. 152 ; of 

 the effects of the density of air on 

 the rates of, ii. 220. 



Clanny (Dr. W. II.) on procuring a 

 steady light in coal mines without 

 the danger of explosion, i. 467. 



Clift (W.) on the influence of the spi- 

 nal marrow on the action of the 

 heart in fishes, ii. 10; description 

 of some fossil bones found in caverns 

 at Oreston, ii. 1 86. 



Coagulation, on the changes the blood 

 undergoes in the act of, ii. 90. 



Coal, remarks on the natural formation 

 of, i. 159, 223. 



Coal and oil gases, on the heating 

 and illuminating powers of, ii. 119 ; 

 experiments on, ii. 143. 



Coal gas, application of to economical 

 purposes, i. 294. 



Coal mines, on the fire damp of, and 

 methods of lighting to prevent its 

 explosion, i. 467; ii. 30, 32, 35, 61. 



Cobra de Capello (or hooded snake), on 

 the expansion of the skin of the neck 

 of, i. 157 ; on the bite of, i. 355. 



Cohesion of fluids, i. 171. 



Colburn, Zerah, the American calcu- 

 lating boy, i. 486. 



Colchicum autumnale, the effects of on 

 the gout, ii. 41, 42, 71. 



Cold : artificial, on producing, i. 40 ; 

 production of cold by the evapora- 

 tion of the sulphuret of carbon, i. 

 473 ; remarks on sensible cold, ii. 260. 



Collimator, floating, description of, ii. 

 232 ; application of at the Dublin 

 Observatory, ii. 276. 



, vertical floating, descrip- 

 tion of, ii. 340. 



Colon, on some alvine concretions 

 found in after death, ii. 156. 



Coloured rays, on the heating and il- 

 luminating powers of, i. 20, 22. 



Colouring matter of red snow, on the 

 fungi which constitute it, ii. 128. 



Colouring matters of vegetables, on the, 

 ii. 86. 



Colours and light, theory of, i. 63. 



Colours : on some cases of the pro- 

 duction of, not before described, i. 

 92 ; on some phenomena of, ii. 15 ; 

 periodical, on the phenomena of, 

 ii. 368 ; periodical, new class of pro- 

 duced by grooved surfaces, ii. 378 ; 

 prismatic, power of to heat and il- 

 luminate objects, i. 20; produced at 

 the separating surfaces of plate glass 

 and various oils and other fluids, ii. 

 367. 



-, complementary : by polari- 



zed light, ii. 7 ; instruments for ex- 

 hibiting, ii. 25 ; produced by suc- 

 cessive reflexions from the polished 

 surfaces of metals, ii. 408. 



used in painting by the an- 



cients, on the, ii. 11. 



Columbium, a new metal, i. 67. 



Columbium and tantalium, on the 

 identity of, i. 336. 



Comet : new method of deducing a first 

 approximation to the orbit of from 

 three geocentric observations, i. 489; 

 observations of a, i. 272, 297 ; seen 

 at Valparaiso, ii. 158, elements of, 

 ii. 158 ; Dr. Herschel's observations 

 of a, i. 418, 427. 



Compass needle : on the variation of 

 bv the attraction of the iron in ships, 

 i.'l87; ii. 108, 109,110,130, 141, 218, 

 225 ; on the best kind of steel and 

 form for, ii. 141 ; on the permanency 

 of its variation at Jamaica, i. 241. 



Compound lenses and object-glasses, 

 on the aberrations of, ii. 146. 



Compressibility of water, ii. 134; by 

 high degrees of force, ii. 289. 



Compression of the earth, observations 

 with the invariable pendulum for 

 determining, ii. 396. 



Condenser and air-pump, new, i. 460. 



Conic sections, of the rectification of, 

 i. 97. 



Cooinbe (C.) on an elephant's tusk in 

 which the iron head of a spear was 

 found, i. 43. 



Cooper (A.) on the effects which take 

 place from the destruction of the 

 membrana tympani of the ear, i. 10, 

 62 ; remedy for a particular species 

 of deafness, i. 62. 



Cooper (B. B.), anatomical descrip- 

 tion of the foot of a Chinese female, 

 ii. 373. 



2 F. 2 



