Markree, and sidereal chronometer at Killiney. I also ne- 

 glected the difference of longitude between the Obelisk and 

 transit instrument. Thus, a very accurate result could scarcely 

 be expected from but three comparisons. 



" With reference to the two phenomena of August 10th, I 

 have to remark, that if the lines of apparent direction of No. 38 

 Killiney, and No. 71 Markree, be produced to the horizon, the 

 azimuthal difference would amount to 120° ; and in the case 

 of No. 30 Killiney, and No. 13 Markree, the difference would 

 be still greater. This observation does not apply to No. 27 

 Killiney, and No. 8 Markree, on the night of the 12th. Here 

 the parallax was small, and it seems almost certain that the 

 commencement of visible trajectory was observed at Markree, 

 and the end at Killiney, The two shooting stars of the 10th 

 must have been much nearer to the earfh than that of the 

 I2th. Supposing the parallax to be 120°, the distance of the 

 object from each station would be to the distance of the sta- 

 tions from one another as I to -v/3. The base in the expe- 

 riment before us = 98 miles. It is somewhat singular that 

 No. 29 Killiney, and No. 10 Markree, on the night of the 

 12th, and described at both stations to be of extreme bril- 

 liancy, and with magnificent. train, should have been seen 

 within 10' of each other in the same apparent line on the map, 

 but moving in opposite directions." 



