ely wide or band-shaped. The lumen is broad and mostly measures J to J of the entire diameter, sometimes less but rarely more. Frequently, lines are observed stretching across the cells, and a granular protoplasm is usually discernible. The cell walls are of even thickness, so that the lumen is of… … FIG. 18. Cross section of nettle fibres. pressed flat, with, however, an open lumen frequently show- ing granular contents. Microchemical Reactions. — Iodine and sulphuric acid stain blue (pure cellulose). Ammoniacal copper oxide causes great distensions but has no solvent action. Aniline sulphate…
Textile fabrics -- Testing · Yarn -- Testing
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