1821.] Astronomical Observations for Aug. 1821. 223 



Article XII. 



Astronomical Observations, Aus. 1821. 

 By Col. Beaufoy, FRS. 



Bushey Heath, near Stanmorc. 



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



Aug. 4. Immersion of Jupiter's second < 1 1 '» 04' 31" ? Mean Time at Bushey. 



satellite <11 05 52 > Mean Time at Greenwich, 



Aug. 11. Immersion of Jupiter's second < 13 42 25 ? Mean Time at Bushey. 



satellite (\3 43 45 ) Mean Time at Greenwich^ 



Aug. 14. Occultation of A (Immersion 8 48 IT'S ? „ m. t» l 



Aquarius by the moon } Emersion 9 37 16-0 J Mean Tune at Bushe y- 



The immersion of x was instantaneous, and the time certain 

 to one second. Dew having rendered the object glass of the 

 telescope somewhat obscure, the emersion was not so accurately 

 determined. The observation of the immersion confirms my 

 former opinion, that the moon is destitute of an atmosphere, or> 

 if surrounded by one, it is very dissimilar to the terrestrial. 



Aug. 18. Immersion of Jupiter's first CI l h 58' 53" > Mean Time at Bushey. 



satellite 2 12 ° 14 J Mean Time at Greenwich. 



Article XIII. 



Remarks upon Mr. Herapath's Theory. 



(To the Editor of the Annals of Philosophy.) 

 SIR, 



In offering a few remarks on the very ingenious theory pro- 

 posed by Mr. Herapath in some late numbers of the Annals, I 

 beg to disclaim all wish for controversy, and to profess myself 

 actuated by no motives but the desire of contributing to the 

 advance of truth ; and, therefore, trust that both Mr. Herapath 

 and other readers will regard these animadversions with can- 

 dour ; and whether they shall be found to possess any claims to 

 attention or not, will view them, at least, with impartiality. 



The only part of his investigations which I shall at present 

 make the subject of observation is that which relates to some 



Particulars in the physical properties of gases, and the theory of 

 eat. 

 In Prop. VIII. Mr. H. endeavours to show, that supposing in 

 two portions of the same gas the numeratoms are equal, the 

 elasticities will be as the squares of the temperatures. The 



