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[[preprinted]] SMITHSONIAN INSTITUTION 541 [[/preprinted]] [[preprinted left margin]] MADE BY BAKER-VAWTER CO. [[/preprinted left margin]] [[underline]] Bureau of American Ethnology [[/underline]]. The scientific staff of the Bureau continued the work outlined in the annual report. Attention may be called to the investigation of the prehistoric pottery found near Deming in southern New Mexico first described in 1914 by Dr. J. Walter Fewkes, Chief of the Bureau. Fifty more examples have been found in the same neighborhood, and Dr. Fewkes is engaged in the preparation of a monograph on the realistic art depicted on this extraordinary type of pottery. [[underline]] Astrophysical Observatory [[/underline]]. The outstanding feature of the work of the Astrophysical Observatory is the completion of the manuscript of Volume IV of the Annals of the Observatory. This covers all the observations made at Mt. Wilson, California; Hump Mt., North Carolina; and Calama, Chile; from 1912 to 1920, inclusive. From 106 observations of 1918, 1919 and 1920, observed in common, that is within three hours of each other, at Mt. Wilson and Calama, the intensity of the sun's radiation as it is outside the atmosphere was compared independently from the observations at the two stations, separated by about 5,000 miles, with an average deviation of the results of only 0.6 per cent. Both stations agree in showing the variability of the sun through a range of 5 to 6 per cent. On one occasion, at the time of the great sun-spot group of March 20, 1920, which was accompanied by great terrestrial magnetic storms which interfered with the telegraph, and also with strong northern lights which attracted great public attention, the solar radiation fell in 5 days through 5 per cent, recovering after the sun-spot group had passed [[initialed]] CDW [[/initialed]]
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