The topic has obviously been well researched and facts abound concerning the stories of coal, limestone, coke, wrought and pig irons, and the manufacture of steel, but one seriously wonders how many children really care about nails, as such, whether they are machine-made, handmade, sterilized and finished, have two feet and no head or are double headed. We are impressed with their typology and their roles, but not with their ability to generate interest.