Two Years Before the Mast is the personal narrative of Richard Henry Dana Jr., who left Harvard in 1834 because a weakness in his eyes had interrupted his studies, and shipped out as an ordinary seaman rather than as a passenger or officer. He sailed on the brig Pilgrim from Boston, round Cape Horn, to the coast of California, and home again on the ship Alert. The book is built from a journal he kept at the time, and he says he held closely to fact and tried to give each thing its true character.
The early chapters follow a green hand learning the trade. Dana is bewildered by the rush of orders at the first weighing of anchor, seasick, and clearly marked as a landsman. Over weeks at sea he is set to tarring down the rigging, painting the hull from a stage over the side, standing watches, and gradually earning a place among the crew. The pleasure of the work is real but small, and the daily round is long and tiring.
On the California coast the voyage becomes a slow business of collecting hides. The crew lands cargo, carries dried hides through the surf, and spends long stretches curing them on the beach at San Diego, soaking, scraping, salting, and stacking the stiff skins. California in these years is a sparsely settled Mexican province, and Dana records its people, its missions, and the empty harbors with a careful, observant eye that later made the book a historical record of the region.
The hardest passages describe the captain's power. When Captain Thompson flogs two sailors, one of them only for asking why the other was being flogged, Dana stands sickened at the rail, unable to act because resistance at sea is mutiny. The scene fixes the book's theme: command afloat is nearly unchecked, and a cruel master can use it as he pleases. Later chapters carry the crew back round Cape Horn through ice and gales, with the famous run for home under all the canvas the ship can bear.
After the narrative, Dana adds a concluding chapter written once he is back ashore and reading law. There he sets aside adventure and argues practically about seamen: that the captain must keep firm authority for the safety of the ship, but must also be held strictly accountable under the common law, and that the real work is improving the sailor's food, lodging, instruction, and moral welfare. The book's lasting force comes from joining a vivid eyewitness account to this sober plea for reform.