Whitman describes a "n****" who drives a cart with four horses. Like the butcher and the blacksmith from Section 12, the cart-driver does his job well, and Whitman admires his large, strong frame. The cart-driver has complete control over the horse.
He says how he likes to "caress" life with his gaze and, perhaps, his words.
He sees more meaning in the eyes of an ox than in all the books he has ever read.
Again he claims that studying nature is more important than studying books or philosophy.