200 Col. Beaufoy^s Astronomical Observations, [March, 



dropped in, and, as usual, very much increased the ebulhtion. 

 The fluid was kept for some time at this temperature, and the 

 extraneous bodies were alternately added to the wa:ter, and 

 removed from it, when the ebullition was promoted or suspended 

 accordingly for several times in succession. It would appear, 

 therefore, that the boiling point of fluids, while under the same 

 atmospherical pressure, is less uniform than has generally been 

 supposed, and that it is materially influenced by the presence of 

 extraneous bodies. In ether, this difference amounts occasion- 

 ally to 50° or more, and in water to 4° or 5°. J. B. 



Article V. 



Astronomical Observations, 1825. 

 By Col. Beaufoy, FRS. 



Bushel/ Heath, near Stanmore. 



Latitude 51° 3T 44-3" North. Longitude West in time 1' 20-93". 



Jan. 22. Immersion of Jupiter's first JlSh 56' 21" Mean Time at Bushey. 



satellite ?13 .57 42 Mean Time at Greenwich. 



Teb. 9. Emersion of Jupiter's third J 1 1 -59 56 3Iean Time at Bushey. 



satellite (12 01 17 IMean Time at Greenwicli. 



Occultation by the Moon. 

 Jan. 29. Immersion of a small star at .. . 4^ 02' 05-1" Siderial Time. 



Observed Transits of the Moon and Moon-culminating Stars over the Middle Wire of 

 the Transit Instrument in Siderial Time. 



1825. Stars. Transits. 



Jan. 29.— 36 Tauri 3>' 53' 56-9" 



29._f>2Tauri 4 



29.— Jloon 4 



29.— 7r» Tauri 4 



29.-243 Tauri 4 



29.-295 Tauri 4 



Feb. 



-f Gemini 6 



-ti Gemini 7 



-V Gemini 7 



-146 Gemini 7 



-Moon 7 



- P Gemini 7 



-224 Gemini 7 



-I Gemini ^ 



