Emanation in the Lower Regions of the Atmosphere. 21 



The results here are even more definite. An increase of 

 wind is accompanied by a decrease in the amount of ema- 

 nation and a decrease o£ wind is accompanied by an 

 increase of the amount of emanation, 



(4) Considerations of barometric pressure and wind lead 

 up to a consideration of cyclones and anticyclones. 



Search was now made in the * Weekly Weather Reports J 

 of the Meteorological Office for cyclones, anticyclones, and 

 V-shaped depressions, with the following results : — 



Cyclones. 



Mar. l-o, Large irregular shallow cyclone shifting about the North Sea, 

 lo-17«. „ ,, „ ,. ; centre in Denmark. 



17-19. Deep cyclone approaching from the west. 

 24-26. „ „ crossed England ; centre crossed Yorkshire on 



the night of the 24th. 

 29-31. Cyclone crossed England ; centre passed Lincoln at noon on 

 the 30th. 

 May 25-28. Deep cyclone advancing ^ centre reached the Irish Sea, and 



then retreated northwards. 

 J une 2 1-22, Cyclone approaching*. 



Aug. 17-18. „ „ j its centre at Bristol on the morning 



of the 18th. Then it broke up. 

 „ 19-12. Big cyclone • centre between Iceland and Norway. 



W winds in England. 

 „ 23-26, Cyclone crossed Great Britain, centre crossed Scotland on 

 the 24th. 



Anticyclones. 



April 1-2, Anticyclone travelled down from the north and settled with 



its north-south ridge over Great Britain. 

 May 3-7. Large irregular anticyclone, centre over Scandinavia. 

 „ 10-12, „ „ „ protruding over England. 



June 7-11. „ anticyclone advanced, then retreated. 

 „ 14-18. „ ,-, „ ; centre off Spain. (This with 



a huge cj^clone in Russia gave us cold N winds.) 

 Aug. 2-13, Large irregular anticyclone moved eastwards over Central 

 Europe ; centre in Denmark on 5th, Centre retreated 

 to the Atlantic on the 8th, and advanced again ; centre 

 in France on the 12th. 



V-shaped Depressions. 



June 1-3. Large Y-shaped depression travelled Eastwards across the 

 United Kingdom. 



In all the above cases the cyclones gave rain, strong winds, 

 and low emanation values. The anticyclones gave ns fine 

 weather, and in some cases high emanation values (May 10-12, 

 Aug. 3-6, 10-13), and in other cases low emanation values 

 (May 3-7, June 7-11, 14-18). Anticyclones are by no means 



