served at two stations to ascertain their distance from the 

 earth through parallax ; but I fancy that there has no experi- 

 ment been made similar to that which lam about to submit to 

 your notice. 



" Previous to the periodical display of these singular phe- 

 nomena in August last, I communicated with Mr. Graham, 

 my first assistant at the Markree Observatory, suggesting 

 that we should make the trial of obtaining the difference of 

 longitude between Markree Observatory and the Obelisk at 

 Killiney, by means of shooting stars. I fixed on the even- 

 ings of the 10th, 11th, and 12th of August, as those on which 

 it was most probable that the greatest number of these phe- 

 nomena would be seen ; and the room and gallery of the 

 Obelisk were most obligingly placed at my disposal by Mr. 

 Warren. 



" The Markree mean times were, of course, easily deter- 

 mined. Those at Killiney were deduced from transits, ob- 

 served with a beautiful little universal instrument by MM. 

 Ertels, of Munich, and a sidereal chronometer by the late 

 Mr. Sharp, of this city. On the 10th and 12th of August, 

 the shooting stars were noted at both stations : on the 11th 

 only at Markree, the night being overcast with rain at Kil- 

 liney. I have the honour to present the lists of those seen at 

 Markree and Killiney on the 10th and 12th. 



" The first column of the Markree lists gives the number ; 

 the second, the mean time at station ; the third and fourth, the 

 apparent place in the heavens, wherein the phenomena firstly 

 and lastly were observed; the fifth, their estimated duration ; 

 the sixth, tlieir magnitude compared with the fixed stars; and 

 the last, general remarks thereon. 



*' The first column of the Killiney lists gives the number ; 

 and the second, the mean time at station ; but the third, contain- 

 ing the supposed mean time at Markree, corresponding to the 

 mean time at Killiney, by estimation of the difference of longi- 



