311 



anomalous, and it was with no small pleasure that I found the varied 

 phenomena explained in the most satisfactory manner, and agreeing 

 beautifully with the received laws of storms, on the hypothesis of a 

 combination similar to that shewn in the diagram. 



Another striking instance of cyclonic interference was presented by 

 the storm which passed over the North of Ireland, on the 19th Novem- 

 ber, 1850, and reached this place early on the following morning. On 

 the 18th November, about noon, a storm commenced here from S.E., 

 and continued till the afternoon of the 19th, at which time the wind had 

 veered to S.W., shewing that the centre of this storm had passed to 

 northward. The completion of the veering of the wind was prevented 

 by the arrival of the other storm above referred to, and the wind backed 

 to S.E. A very great quantity of rain fell during the night and next 

 day, the wind veering by N.E., and N. to N.N.W. The centre of this 

 storm must therefore have passed to southward of this locality. The 

 21st was fine, wind hght from S.W. 



A third example of the interference referred to, was exhibited by a 

 series of storms which passed over Britain in a direction nearly N.N.W. 

 to S.S.E., between the I8th and 27th of February, in the present year. 

 The first storm commenced on the 1 8th, and had completed its course 

 by mid-day of the 21st, the veering of the wind having been confined to 

 points between W.N.W. and N.N.E., and the centre having passed to 

 eastward. On the evening of the 21st, symptoms of a second storm 

 began to appear. This storm also moved in the same direction, its 

 centre likewise passing to eastward. Its course was regular until the 

 forenoon of the 24th, when it was interfered with by a third storm of 

 quite the same character as the two preceding, but more nearly central 

 here. The barometer fell until nine p.m., when it attained its lowest 

 point, the wind being from S.W. At twelve p.m. the wind had veered 

 to N., and the barometer had risen -05. The wind continued 

 northerly, with a rising barometer, till about three p.m., of the next day, 

 when the wind was backed to S.W. by a fourth storm coming over in 

 the same direction. This storm was nearly central here, and caused a 

 great depression of the barometer. The 26th was very stormy, wind 

 N.N.E. This storm, the last of the series, was permitted to complete 

 its course with regularity, and by three p.m. of the 27th the atmosphere 

 had become settled. During the passage of these storms, heavy 

 snow and hail squalls, with high winds, occasionally interrupted by calms, 

 were very prevalent. 



Numerous other instances of cyclonic interference might be cited, 

 but those now given will, it is hoped, be sufl&cient to serve as examples 

 of their general character. It not unfrequently happens that a series 



