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It is characteristic of glacial soils that they are indefinitely deep. This often is a disadvantageous feature, for the reason that the soil water may pass so far down into the earth that the roots are often deprived of the moisture which they need, and which in ordinary soils is retained near the surface by the hard underlayer.
We had spread them out upon the rocks, and dried them in the sun; for we had seen that, if we could only find something with which to sew them together, we might make all the clothing that we wanted. "The eider-duck skin is very warm, having, besides its thick coat of feathers, a heavy underlayer of soft warm down, which, as I told you before, the ducks pick off to line their nests with.
It is made up of two layers—a thick underlayer which contains blood vessels, nerves, and glands, and a thin surface layer, called the epithelium. The epithelium, like the cuticle, is without blood vessels, nerves, or glands. A middle coat, which is muscular and which forms a continuous layer throughout the canal, except at the mouth.
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