A course in food analysis / by Andrew L. Winton.

  • Winton, Andrew Lincoln, 1864-1946.
Date:
[1917], ©1917
Catalogue details

Licence: Public Domain Mark

Credit: A course in food analysis / by Andrew L. Winton. Source: Wellcome Collection.

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    half with a jack-knife shows the thick black hull, seed coat, or spermoderm, and the gray-yellow much-folded cotyledons with minute resin cavities appearing as minute black spots (Fig. 62). Histology. Fig. 63 shows a cross section through the seed coat and cotyledon and Fig. 64, the elements in surface view. Two layers are highly characteristic, viz., the Outer Epidermis (ep) of the seed coat and the Palisade Layer (pal). Fig. 64.—Cotton Seed. Surface view of outer layers, ep epidermis of spermo- derm with hl hair and sto1 stoma; br outer brown cells; w colorless cells; pal1 and pal2 palisade cells (see Fig. 63); a, b, c layers of inner brown coat of spermoderm; N perisperm; E endosperm; aep outer epidermis of cotyledon with h2 multicellular hair and sto2 stoma. X160. (Winton.) The epidermal cells (Figs. 63 and 64, ep), obtained for study by scraping the outer surface of the seed, are of irregular shape with dark contents. Among them are the bases of the Hairs (Fig. 63, h\ Fig. 64, hl) which remain attached to the seed after removing the major part by ginning. These hairs, the cotton fiber of commerce, are strap shaped, more or less twisted, and have a broad cavity or lumen. The palisade cells (Fig. 63, pal) can be secured in suitable form for examination either by cutting thin cross sections of