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Epicarp, do. do. do. 1 %. 4. Endocarp, do. do. do. 1 1/2 %. 5. Testa or Episperm, do. do. do. 2 %. 6. The figure represents the longitudinal cut of a grain of wheat; it was made by taking, with the aid of the microscope and of photography, the drawing of a large quantity of fragments, which, joined together at last, produced the figure of the entire cut.
The whole of the envelopes of the berry of wheat amount to 3 lb. in 100 lb. of wheat. No. 5 indicates the testa or episperm.
Under this tegument is found a very thin, colorless membrane, which, with the testa or episperm, forms two per cent. of the weight of the wheat. No. 6 indicates the embryous membrane, which is only an expansion of the germ or embryo No. 10. This membrane is seen purposely removed from its contiguous parts, so as to render more visible its form and insertions.
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