The other two lowland writers whom I have selected were contemporaries of Cowper, though Thomson died when Cowper was only seventeen years old. In dealing with their influence, we turn to the Scottish lowlands where they both were born, and from which came their poetic impulse. A traveller, familiar with the low grounds of England, when he first enters the northern lowlands is at once impressed by their much more limited extent. He finds them to occupy comparatively restricted spaces between uplands and highlands, their largest expanse lying in the broad depression between the southern border of the Highland mountains and the great tract of high pastoral land in the southern counties. Another considerable area of them intervenes between these southern uplands and the flanks of the Cheviot Hills. A further contrast to the English type is to be seen in the broken character of the surface. There are no extensive level flats like those of the English midlands, nor any continuous bands of gentle ridge like those of the English downs. The ground is separated into detached districts by ranges of hills, which sometimes even become sufficiently high and broad to deserve the name of uplands. A third characteristic arises from the great diversity of geological structure, and especially the intercalation of abundant volcanic rocks among the other formations. As a consequence of this intermingling of hard and durable materials with others more easily abraded, the topography is diversified by endless crags and hills rising picturesquely out of the surrounding lower country, and often crowned with ancient castles or ruined peels. Such a disposition of the elements of the landscape is accompanied with a much greater diversity in the mantle of vegetation than is seen among the English lowlands. The surrounding uplands and hills, for the most part bare of trees, are clothed with pasture, save where they support a covering of heathy herbage or dark peat-moss. The lower grounds have in large measure been brought under cultivation, but still retain tracts of moorland, haunted by lapwing and curlew. Though the ancient natural wood has mostly disappeared, hard-wood trees are now abundant, while sombre plantations of fir give a northern character to the landscapes.