. Annals of the New York Academy of Sciences. Science. ARCTOWSKI, VOLCANIC DUST VEILS 173 pleions of the years 1883, 1902 and 1912 and the exceptional!}' violent volcanic eruptions which occurred simultaneously, shows that it may be that the volcanic agencies are affected by the same extra-terrestrial factors which influence climatic conditions. How this could be, is a most interesting question leading to many investigations. One may presume, for example, some correlations be- tween the pleionian variation and storm frequency and storm intensity. Pig. 7.—World's temperature and the variatio)i
. Annals of the New York Academy of Sciences. Science. ARCTOWSKI, VOLCANIC DUST VEILS 173 pleions of the years 1883, 1902 and 1912 and the exceptional!}' violent volcanic eruptions which occurred simultaneously, shows that it may be that the volcanic agencies are affected by the same extra-terrestrial factors which influence climatic conditions. How this could be, is a most interesting question leading to many investigations. One may presume, for example, some correlations be- tween the pleionian variation and storm frequency and storm intensity. Pig. 7.—World's temperature and the variatio)i of the frequency of volcanic eruptions and then a correlation between the more or less accentuated rapid oscilla- tions of atmospheric pressure and volcanic eruptions. A relationship between the mean values of interdiurnal differences of atmospheric pressure and the solar cvcle has been discovered by E. Merecki,'^* and, on the other hand, the much discussed relation between barometric changes from day to day, and the frequency of seismic and volcanic phenomena may be accepted as an established fact.'^^ One may '8 R. Merecki : "Wplyw zmlennej dzialalnoscl slouca na czynniki meteorologiczne ziemske," Prace , vol. 19, p. 131. Warszawa, 1908. ?^8 F. Omori : "Note on the Long-period Variations of the Atmospheric Pressure," Bull. Imp. Earthq. Invest. Comm., vol. 2, p. 215. Tokyo, 1908. H. J. Johnsto-V-Lavis : "The Relationship of the Activity of Vesuvius to Certain Meteorological and Astronomical Phenomena," Proc. Roy. Soc. London, vol. 40, p. 248. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, New York Academy of Sciences
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