278 F. H. Bigelow — Studies on the General Circulation 



Figs. 1-3. 



1870 I87S /880 ■ 1885 1890 1895 1300 I90S 



PROM. 

 2000 

 1600 

 1200 

 800 

 4-00 

 -1.0° 

 -0.5° 



0° 

 +0.5" 

 +1.0° 



PROM. 

 + 800 

 +4-00 

 

 -400 

 -800 

 -2.0° 

 -1.0° 

 0° 

 + 1.0° 

 +-2.0° 

























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Fig. 1. Long period of prominences and temperatures. 



Fig. 2. Short period for prominences and temperatures. 



Fig. 3. Summation of variable periods in a single definite period. 



in the temperature system, month by month, year by year, are 

 similar, it is proper to concentrate the departures by taking 

 the mean, t, for several stations, 5 in this case, or n in general. 

 The mean departures, r r , for r years, make good material for 



and 



the discussion of problems concerned with the 



general 



