A concise, plain-language handbook that teaches basic anatomy, common injuries, and diseases encountered at sea, written for crews on ships lacking a surgeon. It opens with essential physiology to explain the parts that suffer, then gives practical, limited therapeutic recommendations and simple procedures for accidents and illness, prioritizing minimal and cautious use of medicines. The text warns against profiteering and overly complex remedies, emphasizes hygiene and preservation of life aboard ship, and favors experience-based, easily applied guidance over abstruse theory.