It is imperative that pressures on the ocean bottom at large depths 

 be measured in some detail. We need to know whether or not standing 

 waves under a storm are as common as microseisms. Currently without 

 such knowledge the theory that microseisms originate under the deep sea 

 stands hedged and inviolate. If there is no increase of microseisms with 

 a storm, then there were perforce no standing waves — if they increase at 

 some stations and not at others, the latter were protected by a barrier. 

 If they appear to approach from the wrong direction at a station, then 

 they were refracted or reflected at a barrier on their way from storm to 

 station. 



When two ideas persist for as long as the above (1) correlation of 

 microseisms with deep sea phenomenon (2) correlation of microseisms 

 with coastal phenomenon, one not violently interested may suspect there 

 is something to both of them. Miss van Straten's paper in this symposium 

 is admirable in bringing this out. 



The purpose of a symposium such as this is primarily to broaden the 

 minds of the members — not to offer each an opportunity to convert the 

 others. As one member remarked, after many years observing micro- 

 seisms at one station one may learn pretty well with what to correlate 

 them. But this does not mean that he would be equally successful in an- 

 other geographic locality. It would even appear that microseisms in Eu- 

 rope and America are not so comparable as we might expect. 



It is to be hoped that each member of the conference will go home 

 to review his own data with new possibilities in mind. 



University of California at Berkeley 

 Berkeley, California 



