1824.] Col. Beaufoy 



Peroxide of mercury • 



Protosulphuret of mercury 



Prototartrate of iron and potash 

 Peroxide of gold ? 

 Iodide of lead 



Benzoate of lead . 

 Bi-sulphuret of mercury 



Iodide of silver 



Protochloride of mercury 

 gold 



Tungstate of silver 

 Benzoate of silver. 



Iodate of baryta . 

 Iodate of bismuth. 



Sulphuret of gold ? 

 Protosulphate of mercury 



Crystallized persulphate of coppe 

 (10 water) 



By-cyanuret of mercury 

 Persulphate of mercury 



t Astronomical Observations. 



| 216 



} 



218 

 224 

 229 



232 



235 



236 



238 



243 

 245 



248 



250 



252 

 256 



Alum (dry) 



Periodide of phosphorus 



Protonitrate of mercury 



Perchloride of mercury 

 Perphosphate of mercury . 



Sub-binacetate of lead 

 Iodate of lead . . 



Iodate of silver . 



Bi-persulphate of mercury 

 Chloride of gold and sodium 



Pemitrate of mercury . 



Protiodide of mercury . 

 — — — — gold . . 



Crystallized chloride of gold 

 sodium (8 water) 



Subtriatacetate of lead 

 Periodide of mercury . 

 Alum (crystallized 25 water) 



and 



} 



197 



26-2 



272 



274 

 277 

 283 



296 



324 

 325 



36S 



386 

 459 



487 



Article VIII. 



Astronomical Observations, 1824. 

 By Col. Beaufoy, FRS. 



Bushei/ Heath, near Stanmore. 



Latitude 51° 37' 44-3" North. Longitude West in time 1' 20-93". 



Jan. 17. Emersion of Jupiter's second < 6 h 07' 47" Mean Time at Bushey. 



satellite \ 6 09 08 Mean Time at Greenwich. 



fin contact with the) ^ h j ./ *►« | 

 Jan. 26.* Jupiter's third satellite .{ planet's limb. .. J J-M.T.Bushey. 



t Immersion 10 25 10 ) 



Jan. 29. Emersion of Jupiter's first ( 9 25 33 Mean Time at Bushey. 



satellite \ 9 26 54 Mean Time at Greenwich. 



Jan. 31. Emersion of Jupiter's second ( 1 1 21 S6 Mean Time at Bushey. 



satellite ( ' • 22 57 Mean Time at Greenwich. 



Feb. I. Jupiter's fourth Ylmmer. 7M8' 35" M.T.Bushey T- 49' 56" M.T.Gr. 



satellite.... } Emer. 9 59 36 10 57 



Feb. II. Immersion of 2 a Gemini by? 9 g , 47 . 6 siderial Tmie . 



the moon ) 



Feb. 14. Emersion of Jupiter's first ( 7 43 56 Mean Time at Bushey. 



satellite ( 7 45 17 Mean Time at Greenwich. 



• According to the Nautical Ephemeris, the eclipse of this satellite took place at 

 13h 18' 35"; but the satellite immerged behind the planet, at 10 h 26' 31' Greenwich 

 time, making a difference of 2 h 52' 04". 



