In 1849, Thoreau published his first book, A Week on the Concord and Merrimack Rivers. The actual voyage was performed by the two brothers Henry and John in the late summer of 1839 in a boat of their own making, "painted green below with a border of blue, with reference to the two elements in which it was to spend its existence." During his Walden retirement, Thoreau worked over the original record of his pleasant outing, expanding it greatly by the inclusion of very various material, and had it published at his own risk by Monroe in 1849. It was the year of the Argonauts, of the gold-rush to California, and such literary treasure as the odd book contained was not much regarded. Though favourably reviewed by Ripley and by Lowell, it did not please the public, and over seven hundred copies