G, J M
In view of the time frame and subject matter it is very likely that the initials "J.M.G." stand for John Mathew Gutch.
Items by this originator
- G., J.M. 'Christ's Hospital – Old Songs once Popular there', Notes & Queries, Series 1, vol. I (1850), pp. 421-22
- G., J. M. 'Dr. Stukeley's Manuscripts, Drawings, and Books', Notes & Queries, Series 1, vol. XII (1855), pp. 321-22