The Uses of Animals in Relation to Industry of Man, Lects
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The Uses of Animals in Relation to Industry of Man, Lects

The Uses of Animals in Relation to Industry of Man, Lects


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ON LEATHEE. In pursuance of the course which I have commenced, I shall now speak of the skin of animals. In my last Lecture I drew your attention to that product of the skin which we call wool, and its various applications in the arts. I alluded to the fact that wool was one of the epidermal appendages, as they are called, of animals. I now pass over the use of other forms of hair, as horsehair, human hair, feathers, quills, hoofs, and horns, all of which are epidermal appendages. I shall come to them again, I hope, by-and-by, and be able to treat of them in a separate Lecture; but now we will talk of the skin, the substance out of which the epidermal appendages grow. I drew your attention to the epidermis in the last Lecture, and stated that the skin was composed of two parts, ?the epidermis and the dermis(Figs. 1 and 2). The epidermis is a membrane composed of several layers of cells on the external surface of the dermis, or true a skin. If ve scrape the skin, we separate a substance, which if we examine under the microscope, we find to be composed of a number of flat cells (Fig. 3); and if we examine deeper, we shall find that some of the cells are spherical; so that this outer portion is entirely composed of cells. This, then, is the epidermis or scarf-skin. The epidermis is continued in the animal ? into the mouth, into the organs of respiration, and the interior organs, where it is called mucous membrane; and we find this mucous membrane is covered with scales, which are called epithelium. I only want to show you here that the skin is continuous with the mucous membrane; and you mayregard an animal as a sort of bag. When the internal organs are formed, the skin is as it were tucked in. But we have nothing to do now with the internal organs or membranes, which are, how...


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Product Details
  • ISBN-13: 9780217643740
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 94
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 0217643744
  • Publisher Date: 31 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr

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