The principles of surgery . y is cut across, bleeding isinstant and rapid; the blood of a florid red color ; and ejected notin a continuous stream, but per saltum. The arterial orifice remainingwidely open, through elasticity of the arterial coats, and energy ofthe hearts impulse being unbroken, much blood is lost in a very briefspace of time, from a vessel of any considerable size; # and, cceterisparibus, the nearer the wound to the centre of circulation, the morerapid the hemorrhage. In recent wounds, such bleeding is their mostprominent and alarming circumstance; the first to claim attentio
The principles of surgery . y is cut across, bleeding isinstant and rapid; the blood of a florid red color ; and ejected notin a continuous stream, but per saltum. The arterial orifice remainingwidely open, through elasticity of the arterial coats, and energy ofthe hearts impulse being unbroken, much blood is lost in a very briefspace of time, from a vessel of any considerable size; # and, cceterisparibus, the nearer the wound to the centre of circulation, the morerapid the hemorrhage. In recent wounds, such bleeding is their mostprominent and alarming circumstance; the first to claim attention fromthe surgeon, with a view to its arrest. The means suitable for this endare termed Hemostatics ; and are of two kinds : the work of Nature;and the work of the surgeon. Natural Hemostatics. These, also, are divisible into two classes: Temporary and Perma-nent. I. The Temporary. 1. The artery, so soon as severed, retracts, in virtue of its elastic nature, within itssheath; leaving the extreme portion of Fig. 92. Fig. and of rough surface. Inspace, coagulation occurs. Retraction of a cut artery shown; a, the orificeof a dead artery; 6, the orifice of a living vesselimmediately after section.—Sir C. Bell. that sheath, which does not retract—be-without the same elasticity—vacant, that vacantParticles offibrin become entangled and adherent tothe rough points of its inner surface ; andthese constitute, as it were, nuclei on whichothers aggregate, to form a clot more orless extensive. 2. Also, by virtue of inherent elasticityof tissue, the cut artery, while it retractswithin its sheath, contracts upon itself, atthe cut point; diminishing its calibrethere; a vital action; producing a me-chanical and obvious obstacle to profuseflow from the orifice — inasmuch as thatorifice, at the moment of incision wide, isin a few seconds diminished to perhaps a half of its first more lax and free the surrounding areolar tissue, the more favora-bly is the vessel situat
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