35 



the whole revolving mass of air was transferred bodily, in 

 "virtue of the progressive movement. But this assumption 

 seems to be negatived by other facts. 



" It has been already mentioned that the greatest force of 

 the storm occurred at Armagh and Markree, before the epoch 

 of minimum pressure, the interval at both places being about 

 four hours and a half. A similar interval took place at Kil- 

 liney, but in the opposite direction, the epoch of greatest in- 

 tensity following that of least pressure by four hours and a 

 half. 



" The last point which appears to demand notice is the 

 curious fact, that there was a considerable interval between 

 the epochs of the greatest intensity of the storm at Dublin and 

 at Killiney, places only ten miles apart. The greatest force 

 of the gale, at Dublin, took place between 1 and 2 p. m. ; at 

 Killiney it occurred between 5 and 6 p. m. There is a similar 

 interval between the times of minimum pressure at the two 

 places, the least height of the barometer occurring at Killiney 

 at 1 p. m., — or later than at Dublin by two or three hours. 

 These differences are probably connected with the difference 

 of altitude of the places of observation. 



" I have thought it right to bring this subject under the 

 notice of the Academy, not only on account of the general in- 

 terest which attaches to it, but also as a specimen of the re- 

 sults which may be expected from the observations recently 

 instituted by this Society. And I gladly avail myself of this 

 opportunity to testify to the fidelity and accuracy with which 

 the observations are now made by the men belonging to the 

 Coast-guard service. So far as regards the meteorological 

 part of the undertaking, little more seems wanting than that, 

 on occasions such as that which forms the subject of this 

 paper, the observations should be taken at shorter intervals."* 



* " Extra observations were taken during the gale at the Coast-guard 

 stations at Caherciveen and Kilrush." 



D 2 



