16 THE ESSEX NATURALIST, mentions those parishes where unenclosed arable land re- mained.18 These were only in the three "Saxon areas" in the north-west, north-east and south-west (fig. 4). Most of these were enclosed during the next few decades; it was "much desired by persons of intelligence." At a slightly earlier date (1775) Chapman and Andre's map shows the position of the corn mills of the County. These are confined principally to the north and central areas (Boulder clay) and appear again in the Fig. 4.—Essex Parishes having Unenclosed Arable in 1795. sandy soil belt. Whilst not infrequent throughout the London Clay area, they are much fewer in number throughout that district. The distribution of these corn mills supports the theory of the regional differentiation of arable and pastoral farming. The distribution of the mills offers a further point of interest. An increase of corn mills throughout the entire County had occurred since the days of Morant (1768). In view of the evidence of the nineteenth century, it appears that towards 18 Vancouver, C. General View of the Agriculture of Essex.