. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history -- California. EDITORIAL In the L5ulletin of the Seismological Society of America, Volume V, page 30, March, 1915, appeared an article entitled "Seasonal Periodicity in Earthquakes," by William A. Spalding. By permission of the Editor of that publication, we re-produce that article in this Bulletin. Several years prior to the organization of this Academy of Sciences, Mr. Spalding, who was one of its Founders and who has served five terms as its President, became interested in the obse
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history -- California. EDITORIAL In the L5ulletin of the Seismological Society of America, Volume V, page 30, March, 1915, appeared an article entitled "Seasonal Periodicity in Earthquakes," by William A. Spalding. By permission of the Editor of that publication, we re-produce that article in this Bulletin. Several years prior to the organization of this Academy of Sciences, Mr. Spalding, who was one of its Founders and who has served five terms as its President, became interested in the observations of Heinrich Samuel Schwabe,—an amateur Astron- omer of Dessau, Germany,—from which was deduced a period- ity in sun-spot phenomena. These labors of Schwabe were in vestigated by Prof. R. Wolf of Zurich, Stewart, De La Rue, J. H. Kedzie, and others, who published monographs upon the subject, but it was not until after a careful study of the theory of Equinoctial perturbation proceeding from the various planets of the Solar system, enunciated in 1875 by Prof. John H. Tice of St. Louis, Mo., that Mr. Spalding became so intensely ab- sorbed in investigating the causes of seismological disturbances. On December 22, 1892, five years before he first became President of this Academy, he read a paper before The Teach- ers' Institute in Los Angeles, in which he presented the con- clusions to which he had arrived. His prediction of the tune for a seismic convulsion was so positive, and the date of its occurrence was so exact, that, had these transpired during the darkness and superstition of the mediaeval periods, his voice would have been acclaimed one of prophecy; but, as has Ijeen 35. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Acade
Size: 1288px × 1940px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, books, booksubjectnaturalhistory
