. Carnegie Institution of Washington publication. THE SOLAR HYPOTHESIS. 249 19(XI IWll 19fl2 I9nr, 1904 1905 190fl 1907 1908 1909 l!liil we will temporarily assume to be the variation of solar radiation) a slight rise of tempera- ture took place at this time; north of the equator this rise causes a hump in the curves for Key West, Tampa, and Savannah; at Raleigh it produces a distinct though unim- portant maximum; at New York this maximum has become important, although not of the first rank, while still farther to the north and east it becomes a primary phenomenon. In similar fashion other pec
. Carnegie Institution of Washington publication. THE SOLAR HYPOTHESIS. 249 19(XI IWll 19fl2 I9nr, 1904 1905 190fl 1907 1908 1909 l!liil we will temporarily assume to be the variation of solar radiation) a slight rise of tempera- ture took place at this time; north of the equator this rise causes a hump in the curves for Key West, Tampa, and Savannah; at Raleigh it produces a distinct though unim- portant maximum; at New York this maximum has become important, although not of the first rank, while still farther to the north and east it becomes a primary phenomenon. In similar fashion other peculiarities can be traced throughout all the curves. Take the month of March 1906, for example. The Arequipa curve shows merely an insig- nificant little hump; in the Key West and Tampa cm-ves this begins to become impor- tant: in those of Savannah, Raleigh, and Washington it becomes of primary impor- tance, while farther to the northeast it once more drops into insignificance. Almost any of the other peculiar features of the curves can similarly be seen to show a maximum development in certain latitudes, and from there to decrease in intensity but by no means to disappear. If Arctowski's pleions are due to variations in the sun's radiation, we should expect exactly this— that is, we should expect to find that they would vary in intensity and in their place of origin, according to the season and other circumstances which determine where the sun's heat is most concentrated. Thus it may happen that at one time a wave of excessive temperature originates in the hot center of the United States during summer, let us say, and produces its maximum effect there only a short time after its origin, while under other circumstances the origin of the wave may be in the North Atlantic Ocean, or south of the equator, and its effect may reach the central United States only in an attenuated form after much delay. Taken as a whole the work of Arctowski seems to indicate three things: (1) In regi
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