Retention of a public officer.
--A petition is in circulation in Richmond, and has been very extensively signed, asking Mr. Lincoln to retain Col. Thos. B. Bigger as Postmaster. It is signed by members of all parties, and states that the Colonel has given satisfaction, as head of postal arrangements in Richmond, to five Presidents of the United States--a fact the public will readily admit. The Whigs protested against his removal when General Taylor was elected, and he was retained. Col. B. is a veteran of the war of 1812. He also, from his long connexion with the post-office, understands its workings better, we suppose, than anybody that the President might be induced to put in his place.
