The parents of an infant boy gave him a bath in a tub with a strong cleaning agent. They had followed the directions on the container of soap grains. The soap is usually used by men and women accustomed to doing arduous manual labor. The boy has developed a severe dermatitis from the soap. The plaintiffs have alleged that the soap manufacturer negligently failed to warn of the danger of using the soap on the sensitive skin of a child, and the directions fail to warn against a use so closely akin to the recommended one.