In December of 1946 the Committee on the Selection of Judges circulated the bar with a postcard ballot, covering mandatory retirement of judges at the age of seventy-five. The ballot resulted as follows: Total vote cast .......................... 942 In favor ......................................753 Opposed ...................................144 No opinion .................................. 45 The Committee on the Selection of Judges, which circulated that ballot, suggested a proposed constitutional provision carry compulsory retirement into effect in connection with an appropriate retirement plan to be established by the Legislature. That Committee accepted the view previously expressed by the State Judicial Council (to which the subject had earlier been referred for consideration) that the result could not be attained by legislation, but could only be carried into effect by constitutional amendment