Lessons in Hygiene, Or, the Human Body And How to Take Care of It : the Elements of Anatomy, Physiology, And Hygiene for Intermediate Grades : Being An Edition of How We Live, Revised to Comply With the Legislation Requiring Temperance Instruction in Scho
Lessons in Hygiene, Or, the Human Body And How to Take Care of It : the Elements of Anatomy, Physiology, And Hygiene for Intermediate Grades : Being An Edition of How We Live, Revised to Comply With the Legislation Requiring Temperance Instruction in Scho
Johonnot James
The book Lessons in Hygiene, Or, the Human Body And How to Take Care of It : the Elements of Anatomy, Physiology, And Hygiene for Intermediate Grades : Being An Edition of How We Live, Revised to Comply With the Legislation Requiring Temperance Instruction in Scho was written by author Johonnot James Here you can read free online of Lessons in Hygiene, Or, the Human Body And How to Take Care of It : the Elements of Anatomy, Physiology, And Hygiene for Intermediate Grades : Being An Edition of How We Live, Revised to Comply With the Legislation Requiring Temperance Instruction in Scho book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Lessons in Hygiene, Or, the Human Body And How to Take Care of It : the Elements of Anatomy, Physiology, And Hygiene for Intermediate Grades : Being An Edition of How We Live, Revised to Comply With the Legislation Requiring Temperance Instruction in Scho a good or bad book?
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Every one knows that those who spend much time in the open air, especially in summer, become tanned or freckled, and that when winter comes again, or they remain in doors for a time, the tan and freckles mostly pass away. This is because the light and the heat increase the pigment. When this takes place in spots, it causes freckles only ; when it affects the whole exposed surface, it causes tan. When persons of a light complexion go from countries distant from the equator into the very warm reg...ions between the tropics, they be- come almost as dark as the native inhabitants. When the natives of 126 LESSONS IN HYGIENE. inner layer of the skin is called the cutis, or true skin. The part of this nearer the surface is composed of little elevations, which contain blood vessels and nerves, and from some of which arise the openings through which Fig. 30. — Vertical section of the skin, magnified : a, scarfskin ; b, pigment cells; c, papillae; d, true skin; e, f, fat cells; g, sweat glands; h, outlets of sweat glands; I, their openings on the surface of the skin; k, hair follicle; /, hairs pro- jecting from the skin; m, hair papilla; n, hair bulb; o, root of hair; p, openings of oil glands.
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