278 Col. Beaufoy' s Astronomical Observations. [April, 



on a minute fragment of the assay ; globule transparent, orange- 

 yellow, while hot ; when cold, colourless. In R. F. the same, 

 but colour greenish while hot. 



With the same fax, and the assay in fine powder; in O. F. 

 solution more easy ; but a considerable silica skeleton remains 

 undissolved : colour as before, but deeper. In R. F. nearly 

 colourless, hot; when cold, slightly inclining to an amethystine 

 colour. By the addition of a morsel of tin foil, the amethyst 

 colour a very little deeper. 



With nitrate of cobalt, black mass, without any indication of 

 alumina. 



In addition to the silica, iron, and manganese, clearly indicated 

 by the preceding experiments, I obtained, via humida, a consi- 

 derable proportion of lime. By the action of the salt of phos- 

 phorus, in the reducing flame, there appears to be a minute 

 portion of titanium present, but want of time, and a larger quan- 

 tity of the assay, prevented my obtaining any very decisive 

 results in that respect by operating in the moist way : though 

 they tended to strengthen the probability of its being contained 

 in the mineral : its quantity however must be very minute. 



Article VIII. 



Astronomical Observations, 1824. 

 By Col. Beaufoy, FRS. 



(To the Editor of the Annals of Philosophy.) 



DEAR SIR, 

 I shall be much obliged to any of your astronomical corre- 

 spondents, if they will favour me with their observations on the 

 eclipse of Jupiter s third satellite, which occurred on the 26th of 

 last January, as I think it is probable I committed an error by 

 mistaking one satellite for another, in the observations published 

 in the Annals for March. 



I remain, dear Sir, yours very truly, 



Mark Beaufoy. 



Bushey Heath, near Stanmore. 



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



Feb. 21. Emersion of Jupiter's first J 9'> 39' 02" Mean Time at Bushey. 



satellite ( 9 40 23 Mean Time at Greenwich. 



March 3. Emersion of Jupiter's second til 08 36 Mean Time at Bushey. 



satellite ^ 1 1 09 57 Mean Time at Greenwich. 



March 8. Emersion of Jupiter's first < 7 58 22 Mean Time at Bushey. 



satellite ( 7 9 43 Mean Time at Greenwich. 



March 12. Occupation of * Leonis by the > 7 ^ 34-7 Mean Time at Bushey. 



moon. Immersion y ' 



