m density than the land masses. I found the slight difference is too small to account for the fuel effects I spreading cited. Physicists learn have that Drillis that even this slight difference if given time enough could effect produce the results seen. Drillis holds that the suboceanic mass in which spreading takes place maybe a one 100 miles deep. Beneath this there will be such high pressure that there centre no unequal movement. This his idea that these suboceanic masses are spreading laterally and ontheward as pushing of the continental margins. Thus :- altetic. sand 75mils. 120 mils. Surface of sea bottom face sub oceanic mass