. Earthquakes and other earth movements. Earthquakes. EAKTH TKEMORS. 321 and the other perpendicular to such a direction. These movements, according to Bertelli, have no connection with the wind, rain, change of temperature, and atmo- spheric electricity. The disturbances, as recorded at different towns, are not always strictly synchronous, but succeed each other at short intervals. If, however, we take monthly curves of the disturbances as recorded at different towns in Italy, P J F M A M J SON Bologna I874-J875 Pome 1874 -1875 Florence 1874-1875 Mallets Curve 5879 Earthquakes Mean Micros!esm
. Earthquakes and other earth movements. Earthquakes. EAKTH TKEMORS. 321 and the other perpendicular to such a direction. These movements, according to Bertelli, have no connection with the wind, rain, change of temperature, and atmo- spheric electricity. The disturbances, as recorded at different towns, are not always strictly synchronous, but succeed each other at short intervals. If, however, we take monthly curves of the disturbances as recorded at different towns in Italy, P J F M A M J SON Bologna I874-J875 Pome 1874 -1875 Florence 1874-1875 Mallets Curve 5879 Earthquakes Mean Micros!esmi& Curve for Florence 1872-1876. Fig. 38. we see that these are similar in character. The maximum of disturbance occurs about the winter solstice, and the minimum about the summer solstice, and in this respect they exhibit a perfect accordance with the curves drawn by Mallet to show the periodicity of earthquakes. The accompanying curves taken from one of Bertelli's original memoirs not only show this general result but also show. 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 Milne, John, 1850-1913. New York, D. Appleton and company
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