CONSIDERABLE COMMENT was excited by the appearance in the news columns of yesterday's National Journal of the following paragraph: The Secretary of State for Foreign Affairs (Sir Philip Ramon) has during the past few weeks been the recipient of threatening letters, all apparently emanating from one source and written by one person. These letters are of such a character that they cannot be ignored by his Majesty's Secretary of State for Foreign Affairs, who hereby offers a reward of Fifty pounds (L50) to any person or persons, other than the actual writer, who will lay such information as will lead to the apprehension and conviction of the author of these anonymous letters. So unusual was such an announcement, remembering that anonymous and threatening letters are usually to be found dail