ARCTOWSKI, CHANGES IN DISTRIBUTION OF TEMPERATURE 99 



The curves of the stations along the Atlantic coast have already been 

 published in my paper on the climatical clianges recorded in New York 

 City. In that paper I said: 



"The Arequipa curve descends ; all the others, on the contrary, are ascending 

 curves (Fig. 53). This contrast leads to the conclusion that the pleionian 

 crests are independent of the long-range variations. Annual departures from 

 ten-yearly means may therefore lead to very erroneous conclusions. At Are- 

 quipa, for example, the annual means for 1901 and 1902 are higher than the 

 average of the decade taken into consideration ; they form positive departures, 

 although belonging to a depression of the curve. 



"This is a strong argument against using such departures without consider- 

 ing at the same time the trend of the curves. Now, the Arequipa curve has 

 four crests and four depressions. So has the curve of New York. The most 

 important difference between the two curves is that the maxima and minima 

 of the curve of New York occur a few months later than those of Arequipa. 

 One may say about three months later. 



"All the other curves are identical with the curve of New York in some 

 particulars. For example, the depression of 1904 appears on all the curves. 

 It occurs sooner in Tampa and Savannah than in Raleigh, Washington and 

 New York. In Portland, and even more so In Eastport, this depression is 

 very much retarded. The first crest in the Eastport curve, furthermore, re- 

 appears, although greatly diminished, in the first depression of New York, 

 which later corresponds to that of Arequipa. One can follow the gradual 

 attenuation of this feature going south. For 1902 we have a positive de- 

 parture in Eastport belonging to a pleion. This pleion (1901-1902) has evi- 

 dently nothing in common with the equatorial variation of Arequipa and the 

 other tropical stations. It is another wave having another origin and whose 

 occurrence is marked all along the Atlantic coast in the midst of the anti- 

 pleionian deficiency of temperature. About 1905 the curves of the southern 

 stations differ greatly from the Arequipa curve. The curves of the northern 

 stations, on the contrary, are similar to the curves of Arequipa and New York, 

 except at the end. In Eastport we indeed notice a crest between 1909 and 

 1910 which is not a retarded crest, and going south, we observe the same 

 attenuation of this phenomenon as between 1901 and 1902." 



I will compare the other curves in a similar way. 



In the following diagram (Fig. 54), I reproduce the curves of Miles 

 City, Duluth, Sault St. Marie and Eastport. These curves are ver\' much 

 alike. The only striking difference is that the variation of Miles City is 

 more or less in advance of the others. 



The curves of Fig. 55 are those of the line of stations between Havre, 

 Mont,, and New Orleans. The variation of New Orleans is to a certain 

 extent opposite to that of Havre, and so it is most interesting to compare 

 the diagrams one by one and see how the features of one curve gradually 

 disappear in favor of those of other curv'es. The curve of "Wichita, in 

 particular, has a most unsettled appearance, since it participates in the 



