[Dayton, Amos Cooper]. Theodosia Ernest; or, The Heroine of Faith & Ten Days' Travel in Search of the Church (2 volumes). Philadelphia: Vol. I. - American Baptist Publication Society; Vol. II. - Bible and Publication Society, 1866. 
Two volumes in green cloth, both with the ABS emblem on front, slightly different shades of green, both dated 1866. A worn set with frayed ends & corners, church library bookplates, front end paper of vol. with with corner torn, 459 + 491 generally clean pp., bindings tight.
Starr, A Baptist Bibliography, lists several editions, printings, &c.
The first volume treats mainly of baptism, while the second does of church polity.
Amos Cooper Dayton (1811-18650, b. Plainfield, New Jersey; d. Perry, Georgia. A dentist by profession, Dayton was also a successful author and editor. He was a leader in the “Landmark Baptist” movement, and used his works of fiction to promote their views. Responses came in print from leaders of other denominations, including books by Robert Lewis Dabney (Presbyterian) and William Pope Harrison (Methodist). J. E. Tull considered that Dayton's Theodosia Earnest stories were "the most cogent attack upon 'alien immersions' which the Landmark movement produced." - Tull, A Study of Southern Baptist Landmarkism in the Light of Historical Baptist Ecclesiology (1960).