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The alluvials in the bottoms should here prove unusually rich, and means might be adopted by which they should be raised mechanically and then flumed down again. Ample water supply exists both for hydraulic mining and reef-working; there are good sites for all necessary machinery and building, and timber as usual is to be had in any quantity that may be required.
If the reader will look at a modern geological map, he will see from Wallingford to Bray a great belt of chalk in which the trench of the Thames is carved. Alluvials and gravels naturally flank the stream, but chalk is the ground rock of the whole. To the west and to the east of this belt he will notice two curious isolated patches, detached from the main body of the chalk.
The soil on which it does best is an alluvial loam, and, if possible, it should not be more than 30 feet to water, as the tree, being a very deep rooter, will penetrate a free soil to that depth. It will do on other free loamy soils, but will not make the same growth as when planted in free alluvials.
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