The concert by the Pierian Sodality orchestra, scheduled to be given at the Harvard Union on Friday evening, December 12, has been postponed on account of the concerts by the Stradivarius quartet at Fogg Art Museum and by the Instrumental Clubs at the Commander Hotel on the same evening. The orchestra will play at the Union sometime during the middle of February. It was decided that the playing of the concert on the date set would too greatly inconvenience all the organizations concerned.