596 INDEX. 



R. 



Ross (Commander James Clark). On the position of the north magnetic pole, 47. 



S. 



Shingle beaches, observations on the motions of, 567. 



Sphinx ligustri, on the nervous system of, during the latter stages of its pupa and its imago state, 

 and on the means by which its development is effected, 389. 



Steam vessels, an investigation of the laws which govern the motion of, deduced from experi- 

 ments, 309. 



T. 



Thermal spring, on the quantity and quality of the gases from that of the King's Bath, at Bath, 1 . 



Appendix to Dr. Daubeny's paper on the gases from that of the King's Bath, 13. 



Tides, on the empirical laws of those in the port of London, &c., 15. 



— — on the, 143. 



Torpedo, observations on, with an account of some additional experiments on its electricity, 531. 



on the Mediterranean species of, 540. 



U. 



Ure (Andrew, M.D.). Analysis of the Moira brine spring near Ashby-de-la-Zouche, Leicester- 

 shire ; with researches on the extraction of bromine, 577. 



V. 



Voltaic battery, general remarks on, in its active state, 465. 

 Voltaic circles, on simple, 425. 



on associated, or the voltaic battery, 454. 



Volta-electricity, on a new measurer of, 85. 



W. 



Wheatstone (Charles, Esq.). An account of some experiments to measure the velocity of elec- 

 tricity and the duration of electric light, 583. 



Whewell (Rev. William). On the empirical laws of the tides in the port of London ; with some 

 reflections on the theory, 15. 



Z. 



Zenith telescope, some suggestions relative to the best method of employing the new one lately 

 erected at the Royal Observatory, 209. 



LONDON: 



PRINTED BY RICHARD TAYLOR, 



RED LION COURT, FLEET STREET. 



