INDEX ir. 



277 



Sun-spots, atmospheric ozone, rain, and 

 force of wind, Dr. J. Moffat on the 

 apparent connexion between, 31. 



•Symonds (Rev. VV. S.) on changes of 

 climate during the glacial period, 82. 



Symons (G. J.) on the rainfall in Mon- 

 mouthshire and the Severn valley on 

 July 14th, and on some subsequent 

 floods in England and Wales, 31. 



Tannic acid, J. Watts on Miintz and 

 Ramspacher's apparatus for the esti- 

 mation of, 46. 



*Tanning of sole-leather in Bristol, S. 

 Evans on the, 209. 



Tawney (E. B.) on the age of the Can- 

 nington-Park limestone, and its rela- 

 tion to coal-measures south of the 

 Mendips, 82. 



Taylor (II. M.), contributions to the 

 mathematics of the chessboard, 21. 



(J. E.), discovery of a submerged 



forest in the estuarv of the Orwell, 

 82. ' . 



Tennant (Prof J.) on the South-African 

 diamonds, 82. 



Theorems on the wth roots of unity, J. 

 W. L. Glaisher on, 13. 



Thomson (J.) on a new genus of rugous 

 corals from the mountain-limestone 

 of Scotland, 83. 



* (Sir W.) on Laplace's process for 



determining an arbitrary constant in 

 the integration of his differential 

 equation for the senudiurnal tide, 23; 

 •general integxation of Laplace's dif- 

 ferential equation of the tides, 23 ; 

 *on the integration of linear differen- 

 tial equations with rational coeffici- 

 ents, 23 ; *on some effects of La- 

 place's theory of tides, 23 ; *on the ef- 

 fect of stress on the magnetism of soft 

 iron, 29 ; *on a machine for the cal- 

 cidation of tides, 253. 



* and J. Hopkiuson on nietliods of 



giving distinctive characters to light- 

 houses, 253. 



(W.) on apparatus and modes 



of examination for tlie source of pol- 

 luted air, 45. 



Thornycroft (J. I.) on vertical motion 

 of vessels, 252. 



*Thorpe (Prof T. E.) on anew gaseous 

 compound of fluorine and phosphorus, 

 45. 



Tidal currents, the drifting power of, 

 and that of wind-waves, G. H. Kina- 

 han on, 74. 



*Tide, the semidiurnal, Laplace's pro- 

 cess for determining an arbitrarv con- 



stant in the integration of his difl'eren- 

 tial equation for, Sir W. Thomson on, 

 23. 



Tides in the Irish Sea, J. N. Shoolbred 

 on, 250. 



* , Laplace's differential equation of 



the, general integration of, by Sir W. 

 Thomson, 23. 



* , Laplace's theory of, Sir W. Thom- 

 son on some ett'ects of, 23. 



* , Sir W. Thomson on a machine 



for the calculation of, 253. 



Tilden (W. A.), researches on the crys- 

 talline constituents of aloes, 46. 



Tin-ore, 0. Le Neve Foster on the de- 

 posit of, at Park of Mines, St. Cohimb, 

 Cornwall, 64. 



Titano-silicic glass. Prof Stokes and J. 

 Hopkinson on the optical properties 

 of a, 26. 



*Tobacco trade of Bristol, T. Davey on 

 the, 40. 



Topley (W.) on the Channel tunnel, 

 253. 



Tower (B.) on a machine for obtaining 

 motive power from the motion of a 

 ship among waves, 253 ; on a revolu- 

 tion-indicator, 254. 



Toynbee (Capt. H.) on the physical 

 geographv of that part of the Atlantic 

 which lies between 20° N. and 10° S., 



and 

 196. 



extends from 10^ to 40"^ W., 



Traill (W. A.) on the occurrence of a 

 lower boulder-clay or till with shells 

 in the counties oi' Down and Mayo, 

 Ireland, 83 ; on a mass of travertine 

 or calcareous tutt', called " The Glen 

 Rock," near Ballycastle, County 

 Mayo, Ireland, 84. 



Transit of Venus, Dec. 8, 1874, Rev. 

 S. J. Perry on the, 24. 



, Dr. J. Janssen on the obser- 

 vations of the, made in Japan, 26. 



Travertine or calcareous tuff, a mass of, 

 called " The Glen Rock," near Bally- 

 castle, County Mavo, Ireland, W. A. 

 Traill on, 84. 



'Treatment of sewage, J. C. Melliss on 

 the, 45. 



Tribe (A.) and Dr. J. H. Gladstone on 

 the action of the copper-zinc couple, 

 43; on the augmentation of the 

 chemical activity of aluminium by 

 contact with a more negative nietal, 

 43. 



Tropa-uhtm, Prof. A. Dickson on abnor- 

 mal flowers of, 157. 



* Tvrneracece from Rodiiguez, I. B. 

 Balfour on, 156. 



