398 Intelligence and Miscellaneous Articles. 



taken not to confound eddies arising from local obstructions with 

 the general direction of the current. 



" The observations of the barometer and of the dry- and wet-bulb 

 thermometers made at the magnetical observatory on the day of the 

 storm are the following : — 



** The fall of rain and melted hail during the storm amounted only 

 to 0*596 of an inch ; but it is probable that the hail was driven out 

 of the receiver of the gauge by the wind. 



" It will be seen that the barometric fluctuation is small. It is 

 stated, however, on what seems good authority, that a sudden and 

 considerable fall of the barometer took place shortly before the storm. 



" I have collected from the newspapers and other sources such in- 

 formation as I could obtain respecting the area of the city visited by 

 the gale, but it is as yet very incomplete. It appears, however, that 

 the diameter of the vortex was not very different from the length of 

 the city from north to south ; the limits of the gale being, namely, 

 the Royal Canal on the north side, and the Grand Canal on the 

 south. Hail fell, however, abundantly beyond the limits of the gale. 

 Thus, at the gardens of the Royal Dublin Society at Glasnevin, the 

 damage done by the hail was very great; but it was limited to the 

 roofs of the houses, the hail having fallen perpendicularly. 



" Further information is wanting also to enable us to determine 

 exactly the progressive movement of the entire of the vortex. We 

 are informed by the newspapers that a similar storm to that which 

 visited Dublin, although not so severe, took place at Muliingar, 

 about an hour and a half previously. If this be the same storm, the 

 direction of its path must have been curvilinear. There seemed to 

 be a disturbance of electrical equilibrium, accompanied by rain, in 

 many remote parts of Ireland on the same day." 



The President exhibited drawings of some of the hailstones which 

 fell during the storm, and stated that they consisted of alternate 

 layers of snow and ice, with a central nucleus of snow. 



LI. Intelligence and Miscellaneous Articles, 



ON OZONE. BY M. SCHONBEIN. 



AT the request of M. Becquerel, M. Schonbein repeated before 

 him various experiments relative to ozone ; of these the author 

 furnished M. Becquerel with a detailed account, from which the 

 following statement is extracted : — 



