The Human Hair Its Structure Growth Diseases And Their Treatment
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In the feather of a bird^ which is a modification of the hair, the white pith, with its dense external coveriQg, is very evident in the shaft, while the quill is an illustration of the outer parts alone, the transparent puckered membrane, which is drawn out of the quill when first cut, being a single row of dried-up cells. In the growing feather, the contents of the quill would be found distinctly cellulated.
The arrangement of a central tube in the axis of the hair adds a great deal to the ela...s- ticity of the hair, while it diminishes its weight; and yet the hair is of considerable strength, which depends upon the properties of the cortical or fibrous substance. A single hair from a boy eight years of age, says Ko- binson, in his '^ Essays on Natural Economy, ^' supported a weight of 7812 grains; and from a man aged twenty -two, 14, 285 grains; and a hair from a man of fifty-seven, 22, 222 grains. Muschenbroeck found that a human hair, fifty-seven times thicker than a silkworm's thread, would support a weight of 2069 grains ; and a horse's hair, seven times thicker, 7970 E % 52 MICROSCOPICAL STRUCTURE grains.
What to read after The Human Hair Its Structure Growth Diseases And Their Treatment?
You can find similar books in the "Read Also" column, or choose other free books by Hermann Beigel to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In the feather of a bird^ which is a modification of the hair, the white pith, with its dense external coveriQg, is very evident in the shaft, while the quill is an illustration of the outer parts alone, the transparent puckered membrane, which is drawn out of the quill when first cut, being a single row of dried-up cells. In the growing feather, the contents of the quill would be found distinctly cellulated.
The arrangement of a central tube in the axis of the hair adds a great deal to the ela...s- ticity of the hair, while it diminishes its weight; and yet the hair is of considerable strength, which depends upon the properties of the cortical or fibrous substance. A single hair from a boy eight years of age, says Ko- binson, in his '^ Essays on Natural Economy, ^' supported a weight of 7812 grains; and from a man aged twenty -two, 14, 285 grains; and a hair from a man of fifty-seven, 22, 222 grains. Muschenbroeck found that a human hair, fifty-seven times thicker than a silkworm's thread, would support a weight of 2069 grains ; and a horse's hair, seven times thicker, 7970 E % 52 MICROSCOPICAL STRUCTURE grains.
What to read after The Human Hair Its Structure Growth Diseases And Their Treatment?
You can find similar books in the "Read Also" column, or choose other free books by Hermann Beigel to read onlineMoreLess
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