The University of Chicago Science Series, 

 established by the Trustees of the University, 

 owes its origin to a feeling that there should be 

 a medium of publication occupying a position 

 between the technical journals with their 

 short articles and the elaborate treatises which 

 attempt to cover several or all aspects of a 

 wide field. The volumes of the series will 

 differ from the discussions generally appearing 

 in technical journals in that they will present 

 the complete results of an experiment or series 

 of investigations which previously have appeared 

 only in scattered articles, if published at all. 

 On the other hand, they wiU differ from detailed 

 treatises by confining themselves to specific 

 problems of current interest and in presenting 

 the subject in as summary a manner and with 

 as little technical detail as is consistent with 

 sound method. 



