The case of Stephen Baker Barnum, the patriarch of this family, is unique in that he apparently changed the spelling of his surname to Burnham later in life. That change is particularly interesting since the two surnames are quite distinct in the historical record and no other connection has been found between them.
Manly's cause of death was listed as Phthisis, an over-consonanted Greek word meaning "a dwindling or wasting away"; it is pronounced TIE-sis. Phthisis is an archaic name for tuberculosis. A person afflicted with tuberculosis in the old days was destined to dwindle and waste away.
His last residence was at 9 Greenwich Street, New York. He was listed as Burnhan in the 1860 census in the household of his father-in-law Alexander Carlow (Carlan in the census).
He purchased cemetery plots for Stephen and Martha Burnham and is buried with them. In the 1850 census he appeared as Austus; correct age but incorrect sex.
He was a member of the General Society of Mechanics and Tradesmen of NY and the NY Cyrus Jerusalem Lodge.
His business was at at 366 W. 15th in 1869; he was living at 155 W. 16th. His funeral was held at the Union Reformed Church, 6th Ave and 3rd St NYC.