4-i'O On the visible Solar and Lunar Eclipses 



From the foregoing observations and experiments it may, 

 therefore, be inferred, 



1st. That there is no mercury, or mercurial salt, in the 

 waters of the ocean. 



2dly. That sea-water contains no nitrates. 



iJdly. That it contains sal-ammoniac. 



4thlv. That it holds carbonate of lime in solution. 



5thly. That it contains no muriate of lime. 



ethly. That it contains a triple sulphate of magnesia and 

 potash. 



Some of these circumstances will, of course, require that 

 former analyses of sea-water, and my own in particular, should 

 be corrected and revised ; but this I sliall not attempt to do, 

 until I have obtained further and still more precise informa- 

 tion on the subject. 



Harley-strect, June !20, 18!C2. 



LXXXIX. On tlic visible Solar a7id Lunar LcHj)ses 'which 

 will happen in the Year 1823, as calculated for Greenmch 

 and Aberdeen ,- the Elements being calculated J rom the Tables 

 of M. Delambre and M. Burckhardt. By Mr. Gkokge 

 Innes *. 



[The times are inserted according to civil account, the day being reckoned 

 to begin at midnight.] 



To theEditors of' the Philosophical Magazine a?id Journal. 



Gentlemen, — In calculating the two lunar eclipses, I have 

 increased the moon's equatorial parallax j}jy part for the re- 

 fraction of the earth's atmosphere. Astronomers seem doubt- 

 ful how much is to be added to the semidiameter of the sha- 

 dow of the earth as projected at the distance of the moon; 

 but the quantity must certainly bear some proportion to the 

 parallax. 



I send you the elements of the solar eclipse, for the use of 

 such as may wish to make a projection ; but from the instant 

 of greatest obscuration falling between 5 and 6 o'clock, it will 

 be found very difficult to determine with sufficient accuracy 

 tlie distance of the corresponding points on the respective 

 paths. 



In reference to this eclipse, it will be interesting to observe 

 whether any visible impression is made on the sun's limb at 

 those places which are situated about the extremity of the pen- 

 umbra. Such places will be found a little to the west, south- 

 west, and south of London. 



* Communicated by the Author. 



The 



