1300 



Figure 71. Curves for dififerent meteorological elements with consecutive 

 twelve-month smoothing. T : air temperature. B : air pressure. A : daily- 

 temperature amplitude. M : quantity of cloudiness. P : rainfall. M : dis- 

 turbance of the three magnetic elements at Potsdam, scale on the right. R : 

 daily number of prominences according to the observations in Rome. PC: 

 according to the observations in Palermo and Catania. Twelve-month 

 smoothing. 



