James Croxall Palmer served during the United States Exploring Expedition of 1838–1842 as assistant surgeon aboard the Peacock from late February to mid-April 1839 when it sailed with the pilot boat Flying-Fish on a difficult and treacherous high-latitude foray west of the Antarctic Peninsula. The papers of the Flying-Fish were lost with the destruction of the Peacock at the mouth of the Columbia River in July 1841, thus the book Palmer authored in 1843 under the title Thulia (a pseudonym for the Flying-Fish) became both the sole surviving firsthand account of the excursion and the first Antarctic poetry. A quarter century later, Palmer revisited, revised, and expanded Thulia, publishing it as Antarctic Mariner’s Song in 1868. Palmer’s own proof copies of Antarctic Mariner’s Song were retained by his descendants but were otherwise unknown until they recently surfaced. The proofs with Palmer’s numerous annotations contribute to the expedition’s history. A presentation and discussion constitute this report.