MOTHERS* DAY—.MAY 13On Sunday, Mlay 13, th people of the United States will pay their respects to •motherhood.Mothers* Day is fraught with precious memories. Associatedwith the nobelest of human sentiment are thoughts of making mother happy on her day. Throughout the country this spirit is manifested by sending letters, gifts, greeting cards, flowers, and other suitable remembrances.A letter or package to mother delivered on her day gives its full measure of happiness and cheer. I In • keeping with the occasion, the Department has prepared, as a tribute to the mothers of America, a ; special commemorative postage stamp in the 3-cent denomination, bearing a reproduction of Whistler's noted “Portrait of My Mother.” These stamps will be on sale at poet offices generally beginningMay S.