113 



alone are useful. Hence it follows, that if we have, at a certain step 

 of the process, cos (2^+3 T), its coefficient must be e 2 e' 3 , and 

 this may be written e 2 e' s cos (2 + 3) without fear of mistake ; and 

 this, when combined with such a term as cos (11 V— 11 T), will 

 produce e 2 e' 3 cos (13 — 8). This mode of writing and operating is 

 also a great saving of labour ; for V and T consist of the mean mo- 

 tions, with several constant terms added or subtracted. 



The author states that he has paid great attention to ensuring the 

 accuracy of the work ; having gone through the calculation by two 

 different methods, and compared the values thus obtained, both in 

 several intermediate steps, and in the final results. 



We regard this paper as the first specific improvement in the 

 solar tables made by an Englishman since the time of Halley, as 

 valuable from the care which the author has employed in the nume- 

 rical calculations, as well as for the sagacity he has displayed in the 

 detection of an inequality so small, and of so large period ; and we 

 recommend its insertion in the Philosophical Transactions. 



(Signed) W. Whewell. 



J. W. Lubbock. 



April 5, 1832. 



DAV1ES GILBERT, Esq., M.A. Vice-President, in the Chair. 



Marshall Hall, M.D., Archibald John Stephens, Esq., Sir William 

 Russell, Bart., M.D., Sir David Barry, Knt., M.D., and Charles 

 Boileau Elliott, Esq., were elected Fellows of this Society. 



The following Report, drawn up by Samuel Hunter Christie, Esq., 

 M.A. F.R.S., and John Bostock, M.D. V.P.R.S., on Mr. Faraday's 

 paper, read before the Royal Society on December 15, 1831, and 

 entitled " Experimental Researches in Electricity," was read. 



Report. 



In the first section of this paper, the author considers the induc- 

 tion of electricity in motion. 



Shortly after the discovery by Oersted of the influence of elec- 

 tricity in motion on a magnetic needle, it was almost simultaneously 

 discovered by Arago, Davy, and Seebeck, that iron became magnetic 

 by induction from the connecting wire of a voltaic battery, or the 

 passage of an electric current ; but though the effects at first ob- 

 served w r ere afterwards greatly increased by peculiar arrangements, 

 induction was in all cases restricted to iron. Arago's beautiful ex- 

 periments on magnetic needles vibrating within metallic rings, and 

 on the mutual action of all metals and magnets, when either is in 

 motion, are undoubtedly instances of a peculiar magnetic induction 

 in other metals than iron ; but the very doubtful experiment of Am- 

 pere can scarcely be adduced as one. The singular results obtained 

 by MM. Marianini, De la Rive, and Von Beek, referred to by our 

 author, are probably due to electric induction. But none of these 



