1822.] Col. Beaufoy’s Astronomical Observations. 357° 
combined with the same number of atoms of sulphur as the pot- 
ash contained. It is thus, for example, that lead precipitates 
with 10 atoms of sulphur, of a fine blood-red colour; but this 
compound exists only for a few seconds, and is soon converted 
into a mixture of common sulphuret and sulphur. The persul- 
phurets of other metals are more permanent ; that of copper, for 
example, which is liver-coloured, and unalterable both by the 
air, and by boiling water. It would be extremely interesting to 
. . =) . . 
ascertain the higher sulphurets produced in this manner, and the 
difference which exists between the sulphurets of various degrees. 
I precipitated salts of copper, by A S*, K S°, and KS'°; but all 
the precipitates resembled each perfectly in colour, and dissolved 
in carbonate of potash forming a brown solution. 
It may be concluded with certainty from the experiments 
which I have detailed, that sulphur cannot combine with an 
oxidated body, and that consequently there exist no alkaline 
sulphurets ; but when a salifiable base takes sulphur in the dry 
way, it is partly reduced, anda sulphate and a metallic sulphuret 
is formed. In the humid way either the same redtiction occurs, 
or water is decomposed, and a part of the base unites to a com- 
pound of sulphur and hydrogen; while the other part combines 
with the hyposulphurous acid, which is produced at the same 
time. 
(To be continued.) 
Articie VII, 
Astronomical Observations, 1822. 
By Col. Beaufoy, FRS. 
Bushey Heath, near Stanmore. 
Latitude 51° 37’ 44°3” North. Longitude West in time 1’ 20:93”, 
: Immer, 9h 27! 51:4” Mean Time at Bushey. 
Oct. 3. Eclipse of Jupiter’s third JImmer. 9 29 12'3 Mean Time at Gieenwich. 
; BAtEMIEE|. 22 )< nclelereia'« Emer. 11 35 11:9 Mean Time at Bushey, 
Emer. 11 36 32°5 Mean Time at Greenwich. 
Oct, 8, Eclipse of Jupiter’s first ae 10 22 37:1 Mean Time at Bushey. 
BACLICE e ‘ain SRplim oahe Immer. 10 23 58-7 Mean Time at Greenwich. 
Oct. 8. Eclipse of Jupiter’s se- §Immer. 12 55 40-6 Mean Timeat Bushey, 
cond satellite. ...... Immer. 12 57 O16 Mean Time at Greenwich. 
; Immer. 13 27 46-2 Mean Time at Bushcy. 
Oct, 10, Eclipse of Jupiter’s third \Immer. 13. 29 O7*L Mean Time at Greenwich. 
satellite. .,..++5+. jEmer. 15 34 Ol*l Mean Timeat Bushey. 
Emer. 15 35 22:0 Mean Time at Greenwich, 
‘ 
