34 S Account of a Meteor seen at London, ifc, 



saturate 279'6G of protoxide, the experiment will perfecfly 

 agree with this calculation, 'ihe diHerence of the propor- 

 tion thus determined for the sulphuric acid from that of 

 40:60 lor the sulphur and o,'^ygen is so inconsiderable, 

 that we may safely assume these mmibers as the true ones. 

 Hence the quantity of sulphuric acid required for saturating 

 a given base may be found by niultiplving its oxygen by 

 5 ; and that of the sulphurous acid, by multiplying the 

 oxygen of the base bv 4. 



VVe cannot expcci to obtain complete accuracy in these 

 analyses until we shall have ascertained, by a very accurate 

 comparison of the specific gravities of oxygen gas and sul- 

 phurous acid gas, the exact con)ponent parts of the lattePj 

 as in the case of the carbonic acid. 



[To be continued.] 



LIV. Accomit of a Meteor seen at London and other 

 Places on ike Night of Monday, March 22, 1813. By 

 JostPH Steevens, Esq. 



To Mr. Tilloch. 



Sir, — 'xls every pfiEEnomenon in meteorology, however 

 trivial, furnishes certain facts towards the improvement of 

 that science, I take the opportunity of communicating some 

 particulars relative to one that appeared on Monday night 

 last. Being in the centre of jMoorfields at Q'^ 22'", viewing 

 the configurations of the satellites of Jupiter, (which at 



that time were * • O * * nearly) a meteor 



of the shape of fig. 1. (Plate VI f.) presented itself almost 

 in the field of the telescope ; its diameter was about 15', and 

 at first nearly stationary and not very bright ; it appeared 

 near the margin of the small thin black cloud from whence 

 it proceeded westward, which was in the direction of its 

 larger end. By the time it had passed through 20°, it had 

 acquired a great brilliancy, at which period it was so much 

 elongated as to occupy a space of 3° or 4°, the head being 

 very much flattened in the front, and the tail terminating 

 in a well delined point forming a very acute isosceles tri- 

 angle. At its first appearance there were several radiating 

 points projecting from it ; but after having proceeded about 

 30^, the rays in front had formed themselves into globules 

 of lio;ht, some of them perfectly unconnected with the 

 meteor, but still driven before it during its whole passage. 

 It proceeded westward, bearing rather to the north, and 



described 



