#10 Cdl, Beauf 01/' s Astronomical Observations. [March, 



separate these two oxides by slightly heating their nitrates so as 

 to peroxidize the nickel. I afterwards poured upon it dilute 

 nitric acid, which dissolved the subnitrate of zinc, leaving the 

 peroxide of nickel unacted upon. It is difficult to perforin this 

 experiment ; for either too much or too little heat alters the 

 results, and the separation is never complete, even when it suc- 

 ceeds well. Another process suggested itself afterwards. The 

 mixture of the two oxides is put into a bulb blown in the middle 

 of a glass tube, through which a current of dry muriatic acid 

 gas is passed : the bulb is to be heated by means of a spirit lamp ; 

 the oxides combine with the muriatic acid ; and the water, as well 

 as the muriate of zinc distil, and may be received in a vial con- 

 taining water. The muriate of nickel being much less volatile 

 than that of zinc remains in the bulb. If the empty bulb be 

 weighed before the commencement of the experiment, and after 

 havmg put the oxide into it, it is necessary only to weigh it to 

 iind the relative weights of the two oxides ; but the muriate of 

 zinc may also be precipitated by subcarbonate of soda, and 

 its quantity determined in a direct mode. 



(To be covtinncd.) 



Article XIII. 



Astronomical Observations, 1822. 

 By Col. Beaufoy, FRS. 



Bushey Heathy near Stanmore. 



Latitude 510 37/ 44.3// ^0^4]^^ Longitude West in time 1' 20-93", 



Jan. 14. Emersion of Jupiter's first < 6" 22' 27" ) Mean Time at Bushe7 



:'l 



satellite ^6 23 48 S Mean Time at Greenwich. 



Jan. 5i.9. Emersion of Jupiter's second ( G 54 16 > Mean Time at Bushey. 



satellite » ( 6 .35 36 $ Mean Time at Greenwich. 



Feb. 6. Emersion of Jupiter's first C 6 40 52 ) Mean Time at Hushey. 



satellite ;6 42 13 S Mean Time at Greenwich. 



