Abstract
This paper deals with the production of long blades of obsidian and flint and with the techniques employed in the production of short blades in Mesolithic and Neolithic industries. Owing to the exigencies of war and the inaccessibility of material the range and the treatment of the subject have necessarily been restricted. Nevertheless the existence of identical techniques in England, Scotland, France, Denmark, Hungary, the Mediterranean, India, America and S.W. Australia, may not be without interest.

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