Will D. Howe, The Cambridge History of American Literature (1917)
“ Like his brother, who lost his life in 1859 exploring South America, he had the spirit of an adventurer, but, though his little volume of Poems (1847) had contained some lines of verse ringing with denunciation of ease and lazy comfort at a time when such a question as slavery was pressing for answer, he had dealt, for the most part not originally or strikingly, only with the eternal themes of minor poets—love, disappointments, passing beauty, the hard fate of the poetical tribe—and did not really find expression for himself until the Civil War. ”
