484 London Electrical Society. 



VI. Path of the Moon's Shadow over the Southern part of France, 

 the North of Italy, and part of Germany, during the Total Eclipse 

 of the Sun on July 7, 1842 (July 8, Civil Time). By Lieutenant 

 W. S. Stratford, R.N. This paper will be found, entire, at p. 346 

 of the preceding volume. 



VII. A letter from Professor Hansen, dated March 1, 1842, in ac- 

 knowledgement of the communication of the Foreign Secretary, an- 

 nouncing the award of the Society's Gold Medal at the last Annual 

 General Meeting. 



" Sir, — I have just now received your letter, by which you an- 

 nounce to me that the Royal Astronomical Society have honoured me 

 with their Gold Medal. I recognise in it a valuable sign of the kind 

 attention of this Society towards me and my labours ; and I beg you 

 to present to them my sincerest thanks. 



" Pray have the goodness to allow the medal to be sent to M. 

 Prsetorius, Secretary and Librarian of His Royal Highness Prince 

 Albert, who will undertake to send it to me. 



" Of late my labours in the lunar theory have been considerably 

 advanced. The calculation of the perturbations is finished, and I am 

 now engaged on the calculation of provisional tables for the purpose 

 of comparing my results with observations, and of determining the 

 correction of the elliptic elements which result from them. I am 

 now giving to these tables the necessary extension, that they may 

 afterwards serve as definite tables, after having applied to them the 

 necessary corrections which are required by the new determination 

 of the elliptic elements. To combine with exactness in these tables 

 the most convenient mode of calculating the places of the moon, I 

 have chosen the form that M. Carlini has given to the tables of the 

 sun, as much as it is possible to do so. However, the labour of 

 calculation of the tables themselves is much increased by this arrange- 

 ment. 



" Repeating my request that you will present my respects to the 

 Royal Astronomical Society, I beg you will accept the sentiment of 

 high consideration with which I have the honour to be, &c. 



" P. A. Hansen." 



LONDON ELECTRICAL SOCIETY. 



[Continued from p. 405.] 



Nov. 15, 1842. — A note from Mr. "Weekes was read, accompanied 

 by specimens of Acarus galvanicus, developed in solution of ferro- 

 cyanuret of potash. 



The following notices were communicated by W. G. Lettsom, 

 Esq., M.E.S. : — 1st. Of a new and important application of gal- 

 vanism, by which Jacobi succeeds in extracting gold and silver from 

 their respective ores. 2nd. Of the employment of electro-magnetism 

 for the movement of machinery, in which it is stated that M. 

 Wagner, to whom the German Diet promised 100,000 florins if his 

 plan really succeeded, now reports that he has surmounted all diffi- 

 culties. 3rd. On M. Peclet's new condenser, an instrument calcu- 



