427 



i. 190, 205, 220; process by which 

 corn tainted with must may be pu- 

 rified, ii. 57. 



Hawkins (John), account of the disco- 

 very of silver in Herland copper- 

 mine, i. 42. 



Hearing: on the structure and uses 

 of the membrana tympani of the ear, 

 i. 1 ; on the effects which take place 

 from the destruction of the membrana 

 tympani, i. 10, 62 ; operation for the 

 removal of a particular species of 

 deafness, i. 62 ; the physiology of 

 the stapes, i. 188; peculiarities in 

 the structure of the organ of hearing 

 of the BaUena Mysticetus, i. 415; 

 on sounds inaudible by certain ears, 

 ii. 133 ; on the difference between 

 the human membrana tympani of 

 the ear and that of the elephant, ii. 

 181. 



Heat : on the solar and terrestrial 

 rays that occasion it, i. 23, 30, 94 ; 

 some remarks on, i. 94 ; causes or 

 symptoms of the variable emission of 

 heat and light from the sun, i. 49, 

 55 ; on the propagation of in fluids, 

 i. 133; on the nature of, i. 139; 

 on new properties of, ii. 33; ac- 

 count of the heat of July 1825, ii. 

 260. 



, animal : experiments on, i. 515 ; 

 influence of the brain on the genera- 

 tion of, i. 388, 439; on the influence 

 ofnerves andganglions in producing, 

 ii. 238, 259. 



, radiant : different refrangibility 



of, i. 21 ; refrangibility of the invi- 

 sible rays of the sun, i. 22 ; inquiry 

 into the nature of, from terrestrial 

 sources, ii 235 ; on the permeability 

 of transparent screens of extreme 

 tenuity by, ii. 310 ; on the passage 

 of through glass screens, ii. 280. 



Heart : on the functions of the heart 

 and arteries, i. 314 ; influence of the 

 brain on the action of the, i. 388 ; of 

 an infant, malformation in, i. 195 ; 

 on the influence of the spinal mar- 

 row on the action of, ii. 8, 10 ; on 

 the principle on which its action de- 

 pends, and the relation which sub- 

 sists between it and the nervous sy- 

 stem, ii. 8, '2'.). 

 Heart wood of trees, on the office of, ii. 



Heavens, observations relating to the 

 construction of the, i. 406. 



Heberden (Dr. W.), account of the 

 heat of July 1825, with remarks on 

 sensible cold, ii. 260. 



Hellins (Rev. J.), improved solution 

 of a problem in physical astronomy, 

 i. 7, 393 ; of the rectification of the 

 conic sections, i. 97 ; on the rectifi- 

 cation of the hyperbola, i. 393. 



Hemisphere, of the penetration of a, by 

 any number of equal and similar cy- 

 linders, i. 434. 



Henderson (T.) on the difference of 

 meridians of the Observatories of 

 Greenwich and Paris, ii. 319. 



Hen-pheasants, on the change in the 

 plumage of, ii. 317. 



Hennell (H.) on the mutual action of 

 sulphuric acid and alcohol, and the 

 resulting compound, ii. 271 ; on the 

 mutual action of sulphuric acid and 

 alcohol, and the process by which 

 ether is formed, ii. 350. 



Henry (Dr. W.) on decomposing mu- 

 riatic acid, i. 14; on the quantity 

 of gases absorbed by water, i. 103 ; 

 apparatus for the analysis of the 

 compound inflammable gases, i. 309 ; 

 on coal gas, i. 310; experiments on 

 ammonia, i. 345 ; analysis of Bri- 

 tish and foreign salt, i. 356 ; expe- 

 riments on the muriatic and oxy- 

 muriatic acids, i. 431 ; on the aeri- 

 form compounds of charcoal and hy- 

 drogen, and experiments on thegases 

 from oil and coal, ii. 143 ; on the ac- 

 tion of finely-divided platinum on 

 gaseous mixtures, ii. 216. 



Herculaneum, experiments on the 

 papyri found in the ruins of, ii. 

 145. 



Herland copper-mine, discovery of sil- 

 ver in, i. 42. 



Herschel (Dr. W.) on the power of 

 penetrating into space by telescopes, 

 i. 5 ; on the powers of the prismatic 

 colours to heat and illuminate ob- 

 jects, i. 20 ; the different refrangi- 

 bility of radiant heat, i. 20, 22 ; me- 

 thod of viewing the sun with tele- 

 scopes of large apertures, i. 20 ; on 

 the refrangibility of the invisible 

 rays of the sun, i. 22 ; investigation 

 of the nature of the sun to find the 

 causes or symptoms of its variable 



