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None of the beds are of great horizontal extent, and there is much cross- stratification in the sands, and in some places black carbonaceous seams and lignite. In the midst of these leaf-beds in Studland Bay, Purbeck shells of the genus Unio attest the fresh-water origin of the white clay. On the whole, they remind the botanist of the types of subtropical India and Australia.
Under such constant drenching the leaf-beds decay, throwing up those gases and vapours in which the orchid delights at home. Thus the amateur should arrange his greenhouse, so far as he may. But I would not have it understood that these elaborate contrivances are essential.
Beneath the staging you may see myriads of withered sticks, clumps of shrunken and furrowed bulbs by the thousand, hung above those leaf-beds mentioned; they are "plumping" in the damp shade. The larger pile of Catasetum there are two may be four feet long, three wide, and eighteen inches thick; how many hundreds of flowers it will bear passes computation.
Dense Conglomerates and Proofs of Subsidence. Flora of the Lower Molasse. American Character of the Flora. Theory of a Miocene Atlantis. Lower Miocene of Belgium. Rupelian Clay of Hermsdorf near Berlin. Mayence Basin. Lower Miocene of Croatia. Oligocene Strata of Beyrich. Lower Miocene of Italy. Lower Miocene of England. Hempstead Beds. Bovey Tracey Lignites in Devonshire. Isle of Mull Leaf-Beds.
One of the leaf-beds consists of a compressed mass of leaves unaccompanied by any stems, as if they had been blown into a marsh where a species of Equisetum grew, of which the remains are plentifully imbedded in clay.
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