INDEX II. 



233 



Sun's, swface, R. Hodgson on a brilliant 

 eruption on the, 36. 



Siis tribes of Morocco, E. Schlagintweit 

 on the, 177. 



Sylvester (Prof.) on a generalization of 

 Poncelet's theorems for the linear repre- 

 sentation of quadratic radicals, 7. 



Symons (G. J.), results of an investiga- 

 tion into the phenomena nf English 

 thunder-storms, 52. 



Symonds (Rev. W. S.) on the selection 

 of a peculiar geological habitat by some 

 of the rarer British plants, 102. 



Synge (Capt. M. H.) on the proposed com- 

 munication between the Atlantic and 

 Pacific, via British North America, 181. 



Tactions of Apollonius of Perga, Dr. 

 Brennecke on some solutions of the 

 problem of, by modern geometry, 4. 



Taylor (Admiral) on means to lessen 

 the loss of life round our coasts ; also a 

 permanent deep-water harbour of 

 refuge by artificial bars, 215. 



Tchihatchef (Pierre de) on the geogra- 

 phical distribution of plants in Asia 

 Minor, 181. 



Tea and alcohols, their action contrasted, 

 by Dr. E. Smith, 145. 



Telegraph, North Atlantic, Col. Schaffner 

 on the geography of the, 178. 



Telegraphic wires, S. W. Silver on gutta 

 percha and india-rubber as insulators 

 for, 212. 



Telegraphic wires, Messrs. Werner and 

 C. W. Siemens on a mode of covering 

 with india-rubber, 215. 



Telegraphic wires, submarine, W. Hall 

 on a process for covering with india- 

 rubber, 211. 



Telegraphs, electric submarine, M. Wer- 

 ner and C. W. Siemens on the princi- 

 ples and practice involved in dealing 

 with the electrical conditions of, 32. 



Telemeter, P. Adie on an instrument for 

 measuring actual distances, 59. 



Telescope, reflecting, for celestial photo- 

 graphy, H. Draper on a, 63. 



Temperature, minimum, at Greenwich 

 and Utrecht, J. Park Harrison on the 

 similarity of the lunar curves of, 44. 



Temperature in mountain countries, J. 

 Ball on a plan for systematic observa- 

 tions of, 37. 



Tenby, Rev. G. N. Smith on three uu- 

 described bone-caves near, 101. 



'Pennant (Prof.) on the Koh-i-Noor pre- 

 vious to its cutting, 87. 



Teredines, British, J. G. Jeffreys on the, 

 117. 



Teredo naval is, Prof. Van der Hoeven on 

 the, 136. 



Thames from Lechlade to Windsor, Rev. 

 J. C. Clutterbuck on the course of the, 

 as ruled by the geological formations 

 over which it passes, 75. 



Thermo. barometers compared with baro- 

 meters at great heights, It. von Schla- ' 

 gintweit on, 50. 



Thomas (R.) on thin films of decomposed 

 glass found near Oxford, 19. 



Thomson (Prof. W.) on atmospheric elec- 

 tricity, 53. 



Thudichum (Dr.) on thiotherine, 72 ; on 

 the physiological relations of the co- 

 louring matter of the bile, 147. 



Thunder, Rev. S. Earnsbaw on the velo- 

 city of the sound of, 58. 



Thunder-storms, English, G. J. Symons 

 on results of an investigation into the 

 phenomena of, 52. 



Tomopteris onisciformis, notes on, by Dr. 

 E. P. Wright, 124. 



Topaz, white, of New Holland, particu- 

 larly fitted for optical purposes, Sir D. 

 Brewster on, 8. 



Train (G. F.) on street railways as used 

 in the United States, 215. 



Travancore, observatory of, J. A. Broun 

 on certain results of observations in 

 the, 20. 



Triassic drift, C. Moore on the contents 

 of three square yards of, from the 

 neighbourhood of Prome, 87. 



Tristram (Rev. H. B.) on the geological 

 system of the central Sahara of Algeria, 

 102. 



Turks in Central Asia, R. von Schlagint- 

 weit on the, 176. 



Tynedale coal-field, J. A. Knipe on the, 86. 



United States, P. P. Carpenter on the 



progress of natural science in the, 109; 



on street railways as used in the, 215. 

 Utrecht and Greenwich, J. Park Harrison 



on the similarity of the lunar curves of 



minimum temperature at, 44. 



Vacuum tubes, electrical, Prof. W. B. 

 Rogers on the phenomena of, 30. 



Van der Hoeven (Prof.) on the anatomy 

 of Stenops Potto, 134; on the Teredo 

 navalis, 136. 



Vancouver's Island, geology of, Dr. Hec- 

 tor on the, 81. 



Venus, planet, on some recorded observa- 

 tions of the, in the seventh century be- 

 fore Christ, 35. 



Verdet (M.) on the dispersion of the 

 planes of polarization of the coloured 



