Which early Thomas Hardy novel was never published?

The early Thomas Hardy novel that was never published is titled The Poor Man and the Lady.1

Written in 1867–68, the work was a class-conscious novel that received sympathetic consideration from three London publishers but ultimately remained unpublished. A publisher's reader, George Meredith, advised Hardy to revise the manuscript to be less opinionated and more shapely, which led Hardy to write his first published novel, Desperate Remedies (1871).1