Fergus M. Bordewich, Bound for Canaan: The Epic Story of the Underground Railroad, America's First Civil Rights Movement (New York: Amistad, 2006), 310.
Smith managed to send a message to the Philadelphia Anti-Slavery Office, advising it to watch for a crate that would be arriving on a certain date, and to open it immediately. Meanwhile, a free black friend of Brown’s arranged for a carpenter to build a box three feet long, two feet wide, and two feet, six inches deep, to be lined with baize cloth. The fit would be tight, allowing the two-hundred-pound, five-foot-eight-inch-tall Brown no space to turn himself around. At about 4 A.M. on March 29, Brown climbed into the box. Three gimlet holes were drilled opposite his face for air. He was handed a few biscuits and a cow’s balder filled with water. After the top was hammered on, the box was addressed to a contact in Philadelphia, and plainly marked “THIS SIDE UP.” Smith had the box delivered to the railway express office, where it was then put on a wagon and driven to the station. By the route that the box would have to follow, Philadelphia lay three hundred and fifty miles away.