R03 



Nickel, oil the separation of iron from, 

 385. 



Ohm, G. S., mathematical investiga- 

 tion of the galvanic circuit, 401. 



Oil of wine, on the formation of, in 

 preparing sether, 380. 



Orchideas, on the structure of the cells 

 in the, 282. 



Parasulphat-ammon, 553. 



Phytogenesis, contributions to our 

 knowledge of, 281. 



Plants, on the formation of cells in, 

 282 ; on the growth of, 298 ; on the 

 origin of the vascular bundles and 

 epidermis of, 303 ; on the propaga- 

 tion of, 306. 



Polarization of heat, 141 ; of light, 

 159. 



Pollen-grains, on the nature of, 302. 



Pressure, atmospheric, 534. 



Probabilities, on the calculus of, 318. 



Rose, H., on the combinations of am- 

 monia with carbonic acid, 98 ; on 

 the theory of the formation of aether, 

 370; on the anhydrous sulphate of 

 ammonia, 551. 



Rudberg, Prof., on the expansion of 

 dry air, 507, 514, 543. 



Salts, on the decomposition of, by 

 water, 370, 384. 



Scheerer, T., on the separation of iron 

 from cobalt, nickel and other metals, 

 385. 



Schleiden, Prof. M. J., contributions 

 to our knowledge of Phytogenesis, 

 281. 



Seed, on the germination of, 301. 



Spermatozoa of plants, on the nature 

 of, 287. 



Spheroid, elliptic, of revolution, on the 

 determination of the axes of, 387. 



Spiders' threads, incombustibility of, 

 146. 



Squares, on the method of least, 317. 



Starch, on the import of, in plants, 



285 ; conversion of, into gum and 

 sugar, 286. 



Sulphat-ammon, 552. 



Sulphovinates, on the decomposition 

 of the, by water, 372. 



Sulphovinic acid, action of heat on, 

 372. 



Telegraphs, employment of galvanic 

 currents for, 263. 



Terrestrial magnetism, on the irregu- 

 lar variations of, 20 ; description of 

 a portable instrument for measuring 

 the absolute intensity of, 65 ; gene- 

 ral theory of, 184, 313; on anew 

 instrument for the observation of 

 the changes in the intensity of, 252. 



Theodolite, description of the, 30. 



Thermo- and hydro-circuits, difference 

 between, 424. 



Thermo-multipliers, remarks on the 

 construction of, 167. 



Thiomelaiiic acid, on the formation of, 

 381. 



Tourmalines, on the double refraction 

 of heat by, 141. 



Vapours, density of, 533. 



Vascular tissue, on the probable origin 

 of, 303. 



Vegetable Physiology, contributions to 

 our knowledge of, 28 1 . 



Water, on the decomposition of salts 

 by, 370. 



Weber, W., on the observations made 

 by the Magnetic Association in 

 1836, 20; remarks on the arrange- 

 ment of magnetic observatories and 

 the instruments to be placed there- 

 in, 25 ; on a small portable appa- 

 ratus for measuring the absolute in- 

 tensity of terrestrial magnetism, 65 ; 

 on the arrangement and use of the 

 bifilar magnetometer, 268 ; on a 

 transportable magnetometer, 565 ; 

 on the term-observations of the 

 Magnetic Association, 587. 



END OF VOL.. IT. 



