Note 417 — Chapter VI · THE PROTO-SIDERIC OR EARLY IRON AGE OF WEAPONS.
Reading edition
Anthrop. Coll. pp. 128–134. ‘Specimens illustrating the geographical distribution of corrugated iron blades, or blades with an ogee section, double skin bellows, and iron work.’ As regards the ogee section, the author should have compared it with the arrow-heads whose plane sides are ‘bellied on a twist’ to cause rotation or rifling.