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the Zuni plateau, writing three large monographs of these subjects, 
which were published by the geological survey. 
Scientific men of Washington, among whom he had many friends, 
say they remember best his paper before the Philosophical Society 
on the '’Greater Problems of Physical Geology. 1 ' in which he pro** 
pounded his theory of isostesy to explain the folding of rocks 
and the oscillations of the earth’s crust, 
Maj. Dutton early became interested in volcanoes and visited 
Hawaii to see volcanoes in action that he might the better under- 
stand the extinct or hearly extinct ones of our own great volcanic 
field on the Pacific coast'* 
The Charleston earthquake in 1886 was the subject of his 
special investigation and report for the geological survey . Since 
his return to military duty and retirement he has published a most 
interesting and comprehensive volume on "Earthquakes in the Light 
ol the new Seismology."' His last contribution to Science, "Vol- 
canoes ana Radioactivity," was read before the Natural Academy of 
Sciences in 1966 
