INDEX. 



969 



Rheometer, on the use of the, for 

 measuring electric currents, 423. 



Rhubarb, action of nitric acid on, 244. 



Ripidolite, analysis of, 22. 



Rose (H.) on the estimation of anti- 

 mony, 152 ; on a series of insoluble 

 salts of phosphoric acid, 320 ; on 

 insoluble alkaline and earthy double 

 arseniates, 323. 



Royal Astronomical Society, proceed- 

 ings of the, 142, 307, 470. 



Royal Institution, proceedings of the, 

 311. 



Royal Irish Academy, proceedings of 

 the, 395. 



Roval Society, proceedings of the, 139, 

 466, 540. 



Sarseau (M.) on the presence of lead, 

 copper and silver in sea-water, and 

 of the last metal in organized beings, 

 156. 



Saturn's ring, on the phaenomena 

 attending the disappearance of, 307. 



Schaeuffele (M.) on the action of sul- 

 phate of magnesia and sulphate of 

 zinc, 479 ; on arsenic in the zincs 

 of commerce, 480. 



Schonbein (M.) on ozone, 398. 



Schorlamite, analysis of, 21. 



Sea-water, on the presence of lead, 

 copper and silver in, 156. 



Shooting stars, on the periodical ap- 

 pearance of, 75. 



Silver, experiments on the extraction 

 of, from its ores in the wet way, 1 ; 

 association of, with metallic mine- 

 rals, and methods of extracting it, 

 153^; on the presence of, in sea- 

 water, 156. 



Sioane (G.) on the connexion of Pope 

 Gerbert with the geometry of Boe- 

 thius, 529. 



Smectite, analysis of, 27. 



Soubeiran (M.) on humus, 481. 



Sounds, multiple, produced by vibra- 

 ting bodies, on the, 27. 



Specula for reflecting telescopes, on 

 the supposed inversion of hydro- 

 statical principles in the casting 

 of, 13. 



Spottiswoode (W.) on the equation 

 Q=q(_w, x,y,2)=w + ix +jy + kz, 

 135; on the quaternion expressions 

 of coplanarity and homoconicism, 

 379. 



Stsedeler (M.) on the action of nas- 

 cent chlorine on lactic acid, 401. 



Steam, on the electricities of, 503. 



Steam-engines, on the theoretical cal- 

 culation of the work done by, 42. 



Stellite, analysis of, 553. 



Stokes (Prof.) on the dynamical theory 

 of diffraction, 235. 



Sugar, on a new process of extracting, 

 from the sugar-cane, 62 ; on a new 

 reagent for ascertaining the pre- 

 sence of, in certain liquids, 482. 



Sulphates of magnesia and zinc, on the 

 action of, 479. 



Tardy (Prof. P.) on a new equation in 

 hydrodynamics, 171. 



Temperatures, on the meeisurement 

 of, 54, 410. 



Terebic acid, on the preparation and 

 properties of, 76 ; on the ethereal 

 compounds of, 77. 



Tessarine, on the true amplitude of a, 

 290. 



Theodolite, on the derivation of the 

 word, 292. 



Thermo-electric currents, on the mea- 

 surement of temperatures by, 410. 



Thermometric scale, 65. 



Tide observations, on the results of, 

 549. 



Tides, on the theory of, 190, 343. 



Tin, on the atomic weight of, 325. 



Titanium, on the cyanide and nitruret 

 of, 67. 



Transit instrument, on a method of 

 correcting the errors due to the 

 forms of the pivots of a, 150. 



Transits, on the method of observing 

 and recording, lately introduced in 

 America, 142. 



Tyndall (J.) on the deportment of 

 crystalline bodies between the poles 

 of a magnet, 178. 



Uziglio (M.) on the waters of the 

 Mediterranean, 404. 



Verdeil (M. F.) on the presence of 

 hippuric acid in the blood, 158. 



Vision, defective, on some phaenomena 

 of, 485 ; binocular, observations on, 

 453. 



Voelcker (Dr. A.) on the watery se- 

 cretion of the leaves and stems of 

 the ice-plant, 377- 



Wallis (J.), notice of a meteor, 318. 



Wartmann (M. E.) on the use of the 



