On one side of the road rose a high, rough bank, where hazels and stunted oaks, with their roots half exposed, held uncertain tenure: the soil was too loose for the latter; and strong winds had blown some nearly horizontal.
There are no more uses of "horizontal" in the book.
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Paintings in which horizontal lines dominate, tend to be relaxing.
The whole thing goes horizontally, too, at least it seems so, and I exhaust myself in trying to distinguish the order of its going in that direction.