507 



mean currents in the two circuits, as measured by a galvanometer or 

 voltameter, might be the same.] 



II. " On the Diurnal Tides of Port Leopold, North Somerset." 

 By the Rev. SAMUEL HAUGHTON, M.A., F.R.S., Fellow of 

 Trinity College, Dublin. Received November 7, 1861. 



(Abstract.) 



The present is the first of a series of communications on the tides 

 of the Arctic Seas which the author hopes to lay before the 

 Royal Society. The MS. materials at his disposal embrace both the 

 Atlantic and Pacific Arctic Tides, for which he was indebted to the 

 Hydrographer, Captain Washington, R.N., to Captain Collinson, 

 R.N., Captain Sir F. Leopold M'Clintock, R.N., and Captain 

 Rochfort Maguire, R.N. 



The present paper discusses fully the diurnal tide of Port Leopold, 

 which is most remarkable from the proportion which it bears to 

 the semidiurnal tide, a proportion which is unusually large. From 

 the discussion of this tide, the author is enabled to announce with 

 confidence several results or laws which he had previously ob- 

 tained and published from the discussion of the small diurnal tides 

 of the coasts of Ireland. 



These results are given in detail in the paper itself. In the con- 

 cluding portion of the paper, the author calculates, from received 

 dynamical theories, the depth of the Atlantic Canal, from the pro- 

 portion of the Solar to the Lunar coefficient, from the Diurnal Soli- 

 tidal and Lunitidal Intervals, and from the Age and Acceleration of 

 the Luni-diurnal Tide. 



lie hopes to forward shortly the discussion of the Semidiurnal 

 and Parallactic Tides of the same locality. 



