220 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 70 



It may be seen that all these curves have a tendency to show a 

 division of the eleven-year period into two or three parts, and this 

 in spite of the two-year and three-year consecutive smoothings. 



THE TEMPERATURE VARIATIONS IN DIFFERENT MONTHS OF THE 

 YEAR IN FORT DE FRANCE 



In figure 79 we give for the diiTerent months of the year (I to XII) 

 as well as for the whole year (A) curves for temperature (?) and 

 air pressure (B) at Fort de France which are smoothed in the same 

 way as the curves of the previous figure. The temperature curves 

 show, as the reader will see, a very good agreeement for all months 

 as well as for the whole year with the inverted sun spot curve S 

 which is at the bottom of the figure ; but in almost all months, par- 

 ticularly in the autumn, the winter and spring months, and least 

 in the months of July, August, and November, there is a marked 

 tendency to a two-fold division of the eleven-year sun spot period. 

 A tendency to such division into two is even shown in the sun 

 spot curve itself, but it comes much plainer to expression in the 

 inverted consecutive three years mean smoothed curve for the dis- 

 turbance of the three magnetic elements in Potsdam (M). 



The curves for the air pressure in Fort de France show less 

 simultaneous agreement for the dififerent months. On the whole 

 they go for the most part inverted to the temperature curves, and 

 therefore directly to the sun spot curve, and this is also indicated 

 in the air pressure curve for the whole year, curve A. The minimum 

 for the air pressure curve falls here in about the middle between 

 maximum and minimum of sun spots. The tendency of the air 

 pressure to inverted course with respect to the temperature is most 

 marked in the summer months, and especially in June to August ; 

 while in the winter months from November to February or March 

 the variations of air pressure have almost the same course as the 

 temperature variations. Also in the air pressure curves there is 

 shown a tendency to a secondary division of the eleven-year sun 

 spot period. 



THE TEMPERATURE VARIATIONS IN DIFFERENT MONTHS OF THE 

 YEAR IN STOCKHOLM 



As an example of the temperature variations in different months 

 in high latitudes we give in figure 80 the temperature curves for 

 Stockholm for each month of the year (I to XII) and for the whole 



