He returned to the counting-room, but, unsated with adventure, joined the disastrous expedition of Lieutenant Strain, during which his health was still more weakened, and he came home again in 1854. In the following year he studied law and was admitted to the bar. In 1856 he entered heartily into the Fremont campaign, and from the strongest conviction. He went into some of the dark districts of Pennsylvania and spoke incessantly. The roving life and its picturesque episodes, with the earnest conviction which inspired him, made the summer and autumn exciting and pleasant. The following year he went to St. Louis to practise law. The climate was unkind to him, and he returned and began the practice in New York. But he could not be a lawyer. His health was too uncertain, and his tastes and ambition allured him elsewhere. His mind was brimming with the results of observation. His fancy was alert and inventive, and he wrote tales and novels. At the same time he delighted to haunt the studio of his friend Church, the painter, and watch day by day the progress of his picture, the Heart of the Andes. It so fired his imagination that he wrote a description of it, in which, as if rivalling the tropical and tangled richness of the picture, he threw together such heaps and masses of gorgeous words that the reader was dazzled and bewildered.
The wild campaigning life was always a secret passion with him. His stories of travel were so graphic and warm, that I remember one evening, after we had been tracing upon the map a route he had taken, and he had touched the whole region into life with his description, my younger brother, who had sat by and listened with wide eyes all the evening, exclaimed with a sigh of regretful satisfaction, as the door closed upon our story-teller, “It’s as good as Robinson Crusoe!” Yet, with all his fondness and fitness for that kind of life, or indeed any active administrative function, his literary ambition seemed to be the deepest and strongest.