Mr. Gilbert Montague of New York will give a tea at his cottage, ‘‘Beaulieu.” Seal Harbor on July 23. If his famous delphinium are in their prime his guests will have a rare treat in store for them.Accompanied by Dr. Devol, theIRev. Dr. Trexler, the commissioner for Russian affairs of the Lutheran World Federation, left Bar Harbor and arrived in New York Tuesday on the first lap of his trip to Yugoslavia. Leaving the United States at 10:30 a. m. by! plane from LaGuardia Airport, he landed in Prague, and this morning again at 10:30 is on his way to Belgrade.