INDEX. 



559 



Reusch (E.) on glass tears, 166. 



Richter (M.) on the preparation of 

 indium, 33. 



Riemann (B.) on electrodynamics, 

 368. 



Rieth (M.) on a new method of pre- 

 paring acetylene, 508. 



Roscoe (Prof. H. E.) on the chemi- 

 cal intensity of total daylight at 

 Kew and Para, 313. 



Rosenthal (J.) on the force which the 

 muscle of a frog can develope in 

 contracting, 325. 



Royal Society, proceedings of the, 65, 

 144,231,304,391,540. 



Rudorff (M.) on solid phosphuretted 

 hydrogen, 220. 



SchifF (M.) on the influence of various 

 liquids on the division of phospho- 

 rus, 223. 



Schlebusch (M.) on the action of hy- 

 pochlorous acid on some of the 

 fatty acids, 511. 



Schwendler (L.) on testing telegraph- 

 cables during the process of sheath- 

 ing, 169. 



Shooting-stars, on the paths and pro- 

 bable origin of, 40; on the age of the 

 November group of, 49. 



Siemens (C. W.) on a resistance- 

 measurer, 2/0. 



Sky, on the colour of the, 275, 356. 



Solar eclipse, August 1868, on the, 

 502. 



radiation, on the intensity of, 



404. 



Solids, on the so-called " inactive " 

 condition of, 136, 229. 



Sorby (H. C.) on the analysis of ani- 

 mal and vegetable colouring-mat- 

 ters by the spectrum-microscope, 

 144 ; on the colour of the clouds 

 and sky, 356. 



Soret (M.) on the density of ozone, 

 26 ; on the intensity of solar radia- 

 tion, 404. 



Spectrum, on the radiant, 302; of 

 the Bessemer-flame, on the, 302, 

 437. . 



microscope, on the analysis of 



animal and vegetable colouring- 

 matters by the, 144. 



Stars, on the physical constitution of 

 the, 304. 



Stokes (Prof.) on the internal distri- 

 bution of matter which shall pro- 



duce a given potential at the sur- 

 face of a gravitating mass, 235. 



Stoney (G. J.) on the connexion be- 

 tween comets and meteors, 188 ; 

 on the physical constitution of the 

 sun and stars, 304; on the solar 

 eclipse, August lb68, 502. 



Sulphur, on some varieties of, 221. 



Sun, on the physical constitution of 

 the, 304. 



Sylvester (J. J.) on inverse orthogonal 

 matrices, tessellated pavements, 

 ornamental tile-work, and the the- 

 ory of numbers, 461. 



Tarleton (Prof. F. A.) on the figure of 

 the bullet which experiences the 

 least resistance from the air, 3/7- 



Telegraph-cables, on the testing of, 

 during sheathing, 169. 



Thallium, on the preparation of, 222. 



Thomson (Prof. Sir W.) on vortex 

 atoms, 15; on a self-acting appa- 

 ratus for multiplying and maintain- 

 ing electric charges, 391. 



Titanoferrite, analysis of British spe- 

 cimens of, 344- 



Tomlinson (C.) on the so-called "in- 

 active" condition of solids, 136,229. 



Ubaldini (M.) on the action of sul- 

 phurous acid on sulphuretted hy- 

 drogen, 221. 



Vapours, on a method of determining 

 the specific gravity of, 1. 



Van der Mensbrugghe (G.) on the 

 tension of liquid films, 192. 



Voit (M.) on the elimination of car- 

 bonic acid and the absorption of 

 oxygen in the waking state and 

 during sleep, 30. 



Voltaic theory, illustrations of the, 

 391. 



Vortex atoms, on, 15. 



Waltenhofer (Prof, v.) on a new me- 

 thod of determining the resistance 

 of galvanic circuits, 77 > 



Wanklyn (Prof.) on Sir B. Brodie's 

 " Ideal Chemistry," 50. 



Water of the Severn at Worcester, on 

 the, 249. 



Waterston (J. J) on gravity in relation 

 to centripetal velocity, 55. 



Watts (Dr. W. M.) on the spectrum 

 of the Bessemer-flame, 437. 



Weber (M.) on the action of chloride 

 of iodine on bisulphide of carbon, 

 220. 



