Ewing Presbytery of the Cumberland Presbyterian Church was formed by the action of the Illinois Synod in the Fall of 1844. Rev. Jesse Pearce was appointed Moderator. Its first meeting was held at Village, White county, Ill., in March, 1845. Its ministers were: Revs. Jesse Pearce, John Porter, Richard Harris, John Crawford, Benjamin Bruce, and Moses J. Pearce. Its congregations (several, at least,) were among the first organized in the State. Its probationers were: J. M. Miller, Thos. Joyner, John Brinkley, R. M. Davis, J. A. Porter, Orison Melvin, A. R. Barow, etc.
[Source: History of the Cumberland Presbyterian Church in Illinois, Containing Sketches of the first Ministers, Churches, Presbyteries and Synods; also a History of Missions, Publication and Education. By J. B. Logan. Alton, Ill.:Perrin & Smith, Book and Job Printers, and Newspaper Publishers, 1878, pages 78-79.]

1881
Melvine, O., Ridgeway, Ill
Ewing, Ill. Presbytery
[Source: Minutes of the General Assembly of the Cumberland Presbyterian Church, 1881, Ministerial Directory, page 84]

1882
ELDORADO, ILL.--Another one of our ministers has fallen. Rev. O. Melvin, of Ridgeway, Ill., died on the second of February. He had been in poor health for about eight years. His death was triumphant.
Z. T. Walker.
[Source: Cumberland Presbyterian, March 16, 1882, page 4]

O. Melvin - Presbytery of Ewing (Ill).
[Source: Minutes of the General Assembly of the Cumberland Presbyterian Church, 1882, page 104.]