Abstract
PROF. GRAHAME CLARK has given tentative estimates of the population of England and Wales, or Britain, in early times. These figures, together with the somewhat firmer estimates for the historical period1 form the basis of Figs. 1 and 3. L. S. Palmer gives tentative estimates of the number of general kinds of materials used for making things2. These form the basis of Figs. 2 and 4.
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