During the 1850s and 1860s there was a dramatic improvement in the quality of the voyage for passengers. Ships began to cater solely to passengers, rather than to cargo or mail contracts, and added luxuries like electric lights, more deck space, and entertainment. In 1867, Mark Twain was a passenger on the first cruise originating in America, documenting his adventures of the six month trip in the book Innocents Abroad. The endorsement by the British Medical Journal of sea voyages for curative purposes in the 1880s further encouraged the public to take leisurely pleasure cruises as well as transatlantic travel. Ships also began to carry immigrants to the United States in “steerage” class. In steerage, passengers were responsible for providing their own food and slept in whatever space was available in the hold.