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Updated: May 21, 2025
When the film is equalized the plate must be detached from the turning table and placed on a cast iron or tin plate heated to not more than 40 deg. or 50 deg. C. A gentle heat is quite sufficient to dry the albumen quickly; a greater heat would spoil it, as it would produce coagulation.
Alterations in the blood itself, such as occur, for example, in certain toxæmias, also favour coagulation. When the thrombus is formed slowly, it consists of white blood cells with a small proportion of fibrin, and, being deposited in successive layers, has a distinctly laminated appearance on section.
A wound made by thrusting a dagger or other oblong instrument into the flesh, is best treated, if no artery has been severed, by applying lint scraped from a linen cloth, which serves as an obstruction, allowing and assisting coagulation. Meanwhile cold water should be applied to the parts adjoining the wound.
There may be some truth in this, but for most of us a bite means a hurt anyway and few will be content to sit perfectly still and watch the little pest gradually fill up on blood. It is not known just what the action of the saliva is, its composition or reaction on the tissues. It is generally supposed to prevent coagulation of the blood that is to be drawn through the narrow tube of the labrum.
After an interval of half an hour add blood to the second tumbler in the same manner, and after another half hour add blood to the third. The water dilutes the salts so that coagulation is no longer prevented. After the blood has been added to the last tumbler make a comparative study of all. Place a clot from one of the tumblers in experiment 3 in a large vessel of water.
Long experience has demonstrated it to be an agent of superior digestibility. It is, indeed, a true milk peptone that is, milk already partly digested, the coagulation of the coagulable portion being loose and flaky, and not of that firm indigestible nature which is the result of the action of the gastric juice upon cow's sweet milk.
Nor can it be affirmed with perfect confidence, that all forms of protoplasm are liable to undergo that peculiar coagulation at a temperature of 40-50 degrees centigrade, which has been called "heat-stiffening," though Kuhne's beautiful researches have proved this occurrence to take place in so many and such diverse living beings, that it is hardly rash to expect that the law holds good for all.
If this be so, then one would simply require to solidify or change the viscosity of this liquid. Would this be difficult? Probably not, for most of the body fluids are of that colloidal nature in which coagulation occurs in the presence of small quantities of special agents. Such a result might cause the individual to lose his equilibrium. This would prohibit all organised movement.
Adrenin is of real use in counteracting the effects of fatigue or in enabling the body to respond to some unusual call for effort. The coagulation of the blood is also affected by the same agent, that is, it coagulates very much more rapidly. Coagulation is also hastened by heightened emotion; a wound does not bleed so freely when the wounded one is angry or excited.
"May I suggest an improvement?" said the doctor. "Many persons are of the opinion that if you take and stir it up well from the bottom for a length of time it will help the coagulation of the particles. I believe that is the practice of Mr. Plumfield and others."
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