Practical hydropathy, including plans of baths and remarks on diet, clothing and habits of . spiration passesoutwards. 362 HANDBOOK OF HYDROPATHY. Structure op Skin.—Taking the skin, in the ordinary popular acceptation ofthe term, as the tegumentary coating of the body extending from the exteriorsurface to the muscles and other organs, it may be considered as consisting ofthree distinct layers, the innermost of which is composed of cellular and adiposematter of soft texture. The middle, called the true skin, derma or corium, is astrong and tough web of interlaced fibres, pervaded by blo
Practical hydropathy, including plans of baths and remarks on diet, clothing and habits of . spiration passesoutwards. 362 HANDBOOK OF HYDROPATHY. Structure op Skin.—Taking the skin, in the ordinary popular acceptation ofthe term, as the tegumentary coating of the body extending from the exteriorsurface to the muscles and other organs, it may be considered as consisting ofthree distinct layers, the innermost of which is composed of cellular and adiposematter of soft texture. The middle, called the true skin, derma or corium, is astrong and tough web of interlaced fibres, pervaded by blood-vessels, lymphatics,•md nerves; and the external, called the epidermis, is a species of semi-transparentvarnish, totally divested of all vascular or fibrous organs, and altogether in-sensible. The thickness of this covering, including all its three layers, thoughvarying much in different parts of the body, nowhere exceeds a small fraction ofan inch; and it will therefore be apparent that its structure can only be submittedto observation and analysis by means of the microscope.— THE HEART.—EROM SIR CHARLES EELl/s ANATOMY OF THE HUMAN BODY. Fig. 1, left ventricle; 2, left auricle; 3, 3, 3, 3, pulmonic veins; 4, 4, two-great branches of pulmonic artery; 5, aorta; 6, carotids and subclavians;7, cava descendens; 8, cava ascendens, with, all its branches from the liver;.9, great coronary vein running along the back of the heart, betwixt the auricleand ventricle, in a groove surrounded by fat. THE HEA11T. 363 On an average one nogshead of blood passes tnrough the heart every hour,night and day, six ounces at every beat. Lardner says, that if a syphon gaugewas inserted into an artery, a column of blood would rise in the tube to theheight of seven and a half feet, so great is the force. He also says, Thearteries are flexible tubes composed of three coatings, the innermost or first ofwhich is a thin and extremely smooth membrane lining the ventricle, and isadapted to
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