INDEX. 



553 



Rainfall, on the sun-spot period and the. 

 469. 



Ramsay (A. C.) on the comparative value 

 of certain geological ages (or groups of 

 formations) considered as items of geo- 

 logical time, 145, 334. 



Ransome (A.) on the bending of the ribs 

 in forced breathing, 42. 



Report of Auditors, 1. 



of the Kew Committee, 20. 



Researches in spectrum-analysis in con- 

 nexion with the spectrum of the sun: 

 No. IV., 391. 



Respirator, on some recent experiments 

 with a fireman's, 359. 



Reynolds (O.) on the refraction of sound 

 by the atmosphere, 295, 531. 



, on the forces caused by evaporation 



from, and condensation at, a surface, 

 401. 



Ribs, on the bending of the, in forced 

 breathing, 42. 



Roberts (W.), studies on biogenesis, 289. 



Roscoe (H. E.), Royal medal awarded to, 



on a self-recording method of mea- 

 suring the intensity of the chemical 

 action of total daylight, 158. 



and Schuster (A.) on the absorption- 

 spectra of potassium and sodium at low 

 temperatures, 362. 



Royal medal awarded to Prof. Allman 

 and Prof. H. E. Roscoe, 11. 



Riicker (A. W.) on the adiabatics and iso- 

 thermals of water, 451. 



Sabine (Sir E.), contributions to terres- 

 trial magnetism : No. XIV., 461. 



Safety -lamps, experiments with, 441. 



Saline solutions, on the absorption of car- 

 bonic acid by, 192, 483. 



, preliminary notice of experi- 

 ments concerning the chemical consti- 

 tution of, 241. 



Salvin (O.), admitted, 380. 



Sanderson (J. B.) on the excitation of the 

 ^ surface of the cerebral hemispheres by 

 induced currents, 368. 



Schafer (E. A.) on the intracellular deve- 

 lopment of blood-corpuscles in Mam- 

 malia, 243. 



Schuster (A.) and Roscoe (H. E.) on the 

 absorption-spectra of potassium and 

 sodium at low temperatures, 362. 



and Stewart (B.), preliminary ex- 

 periments on a magnetized copper wire, 

 311. 



Scott (R. II.) on the employment of a 

 planimeter to obtain mean values from 

 the traces of continuously self-recording 

 meteorological instruments, 435. 



Sea, temperatures of the, at various depths 



below the surface, taken between 1749 

 and 1868 ; collated and reduced, with 

 notes and sections, 462. 

 Sea-water ice, some observations on, 431. 

 Seabroke (GK M.) and Lockyer (J. N.), 

 spectroscopic observations of the sun, 

 247. 



Self-recording method, on a, of measuring 

 the intensity of the chemical action of 

 total daylight, 158. 



Shanks (W.) on certain discrepancies in 

 the published numerical value of TT, 45. 



on the number of figures in the 



period of the reciprocal of every prime 

 number below 20,000, 200. 



, given the number of figures (not 



exceeding 100) in the reciprocal of a 

 prime number, to determine the prime 

 itself, 381. 



on the number of figures in the re- 

 ciprocal of every prime between 20,000 

 and 30,000, 384. 

 Sheep, on the small-pox of, 388. 

 Simpson (M.) on the brom-iodides, 51. 

 Smith (A.), obituary notice of, i. 

 Snakes, Indian venomous, on the poison 



of, 68. 



Sodium and potassium, on the absorption- 

 spectra of, at low temperatures, 362. 

 Solar spectrum, note on displacement of 

 the, 219. 



, on white lines in the, 221. 



Solid states of water-substance, a quantita- 

 tive investigation of certain relations be- 

 tween the gaseous, the liquid/and the, 27. 

 Sound, on the refraction of, by the atmo- 

 sphere, 295, 531. 



, on the stoppage of, by partial re- 

 flections in a non-homogeneous atmo- 

 sphere, 190. 



, on the transmission of, by the atmo- 

 sphere, 58, 359. 



wave, on the division of a, by a layer 



of flame or heated gas into a reflected 

 and a transmitted wave, 190. 

 Sounds, on the pneumatic action which 

 accompanies the articulation of, by the 

 human voice, 277. 

 Spectroscope, on the improvement of the, 



308. 



Spectroscopic notes: No. I. On the ab- 

 sorption of great thicknesses of metallic 

 and metalloidal vapours, 371 ; No. II. 

 On the evidence of variation in mole- 

 cular structure, 372 ; No. III. On the 

 molecular structure of vapours in con- 

 nexion with their densities, 374 ; No. IV. 

 On a new class of absorption pheno- 

 mena, 378. 



Spectrum-analysis, researches in, in con- 

 nexion with the spectrum of the sun : 

 No. IV, 391. 



