COL. IRA W. AINSWORTH. This well known resident of this city died last night after a lingering illness aged sixty-two years. Col. Ainsworth was formerly an active participantin military affairs in this city, having prior to the war been elected captain of the Washington Continentals, from private life. He proved to be a very popular and energetic commandant. At the breaking out of the war he tendered the services of the company to the Government, and on the mustering in, in 1863, of the Tenth Regiment, as the One Hundred and Seventy- Seventh Regiment of New York Volunteers, he was commissioned its Colonel, retained com- mand during its service in Louisiana and the Port Hudson campaign, and returned home with the remnant of the regiment at the conclusion of its term of service. He participated with the men in all the dan- gers of that protracted seige, and gave evidence that he possessed qualities which well fitted him for the position he held. Shortly after his re- turn home he resigned the Colonelcy, and again took up the routine of business life which he had laid down for a time in order to serve his coun- try. Col. Ainsworth was one of our oldest business men, the firm of Ainsworth & Northrup, up to the death of the latter some two or three years ago, being known as the oldest firm that had remained unchanged of any in the city. The firm was established in 1839, the building first occupied being located on Quay street, near Hamilton. Very soon after its organization, however, the firm removed to the present quar- ters, No. 25 State, where the wholesale grocery business had since been conducted by it until the death of Mr. Northrup, after which it was con- tinued by Col. Ainsworth, the surviving partner. Col. A's business career was marked by strict integrity, and his private life by all those quali- ties which earn and retain the esteem and respect of friends.