ARCT0AV8KI, CHANGES IN DISTRIBUTION OF TEMPERATURE 97 



quipa variation affects the entire system of N'orth American pleions and 

 antipleions. 



I have taken the differences between the highest and lowest departures 

 for each map, in other words, the total amplitude between pleions and 

 antipleions. The curve is reversed and 1 have drawn the Arequipa curve 

 imderneath to make the comparison easier. From 1900 until 1906 these 

 two curves are similar. Between 1906 and 1907 an interesting anomaly 

 is noticed. The Arequipa temperatures decreased from 1900 to 1909. 

 In the United States, the differences between pleions and antipleions were 

 also decreasing during that period of years. 



Consecutive Temperature Curves for Several Stations in the 



United States 



In order to simplify the work, it was necessary to take into considera- 

 tion the consecutive means of district data, and it is evident that the 

 overlapping maps obtained from these figures are but a first approxima- 

 tion. I M^ill now complicate the problem anew by showing how. the pass- 

 ing pleions and antipleions affected the succession of means observed at 

 individual stations. 



Table V. — Extreme values of consecutive means 



Highest Lowest <,p^'*^^''^°<^«cc 



Key West 77.6 74.. 3 8.8 l.S 



Tampa 73.0 60.6 8.4 1.9 



Savannah 68.1 64.7 3.4 1.9 



Raleigh ' 61 . 8 58 . 8 . S 2.1 



Washington .-.6.6 52 . 1 4.5 2.5 



New Yorlj 5.") . 9 .oO . 2 5 7 8 2 



I'ortland 46.7 42.1 4.6 2.6 



Eastport 43.6 38 . 9 4.7 2.6 



Sanlt Ste. Mario 42.1 36.3 5 8 3 2 



I>iiltith 41.5 35.0 6.5 3.6 



Havre 44 . 9 37 . 6 7.3 4.1 



Miles rity 48 . 6 48 . 5 5.1 2.8 



North Platte 51.8 47.9 3.9 2.2 



Wichita 57 . 9 54 . 4 3.5 1.9 



Shreveport 67 . 6 63 . 8 3.8 2.1 



New Orleans 71.6 67. 7 3.9 2.2 



Eureka 53.7 50 . 4 3.3 1.8 



Los Angeles 64.6 61.0 3.6 2.0 



El Paso 65 . 1 62 . 2 2 9 16 



Corpus Ohristi 72.4 69.0 .3^4 1.9 



Arequipa ,58.8 56.3 2.5 1.4 



Not taking into account, at present, the actual monthly means, I will 

 examine the consecutive annual means, or rather the curves expressing 

 graphically the variations of these figures. 



The stations for whicli T made the necessary calculations are Eastport, 

 Portland, Me., New York, Washington, Raleigh, Savannah, Tampa, Key 



