Note 383 — Chapter VI · THE PROTO-SIDERIC OR EARLY IRON AGE OF WEAPONS.
Reading edition
M. Keller (Pres. Soc. Ant. Switz.) notes that crudely formed lumps and quadrangular blocks of malleable iron, double pyramids weighing 10–16 lbs., have been found in prehistoric sites. They were probably produced in primitive Catalans. Pieces of iron slag worked by the Kelts were discovered in 1862 on the Cheviot Hills.