Lessons in Elementary Physiology, By Thomas H. Huxley ... Ed. for the Use of American Schools And Colleges By Frederic S. Lee ..
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It gives, when tested, all the reactions characteristic of proteids, and is, in fact, itself a proteid, although somewhat impure. The clotting of the blood is hastened, retarded, or tempo- rarily prevented by many circumstances. (a) Temperature. — A temperature up to or slightly above 40° C. (104° F.) accelerates the clotting of the blood ; a low one retards it very greatly ; so much so that blood kept at a temperature close to freezing point may remain fluid for a very long time indeed: (b') T...he addition of neutral salts to the blood. — Many salts, and more especially sulphate of sodium or magnesium and sodium chloride (common salt), dissolved in the blood in sufficient quantity, prevent "its clotting ; but clotting sets in when water is added so as to dilute the saline mixture. (c) Contact with living or not living matter. — Contact with not living matter promotes the clotting of the blood. Thus, blood drawn into a basin begins to clot first where it is in contact with the sides of the basin ; and a wire intro- duced into a living vein will become coated with fibrin, although perfectly fluid blood surrounds it.
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