Whereas the Mayor of the city of Limerick, has received an anonymous letter, directed to, "Mr. the Mayor of Limerick," put into the Post-Office of Limerick, and received by him on Sunday the 21st instant. If the person who wrote said letter will call on any of the gentlemen of the Secret Committee, and substantiate the information contained in said letter, he shall receive from the Committee, one hundred Guineas reward; his name shall be carefully concealed, and his person protected. Signed by order of the Secret committee, Thomas Casey, Secretary.