Manual of pathological anatomy . g to absorj)tion and also lose their colour, and becomefawn-coloured or white; while towardsthe interior we continue to recognize thedark colour of the blood. The accumula-tion may proceed to such an extent as toobliterate the cavity, and thus establish aspontaneous cure. A considerable amountof organization is obsta^ved to take place insome deposits, manifested by the formationof fibres. The existence of a distinct membrane is assumed by mostwriters to envelope the coagulum. It is a point to which Bizotparticularly drew attention, and upon wh
Manual of pathological anatomy . g to absorj)tion and also lose their colour, and becomefawn-coloured or white; while towardsthe interior we continue to recognize thedark colour of the blood. The accumula-tion may proceed to such an extent as toobliterate the cavity, and thus establish aspontaneous cure. A considerable amountof organization is obsta^ved to take place insome deposits, manifested by the formationof fibres. The existence of a distinct membrane is assumed by mostwriters to envelope the coagulum. It is a point to which Bizotparticularly drew attention, and upon which Hasse dwells latter states that he has never met with an aneurism in whichthis adventitious membrane was not present. Mr. Bowman hasobserved, that the membrane enveloping the coagula in an aneu- * J. W. O^le: Trans. Path. Soc, 1857, vol. viii. p. 170; St. Georges 18^7, p. 2^5; Meiical Times and Gazette, 1866, vol. i. p. 196; see alsoChurch; Trans. Path. Soc, vol. xx. p. 109 ; Semple : Ibid., p. Aneurism of the posteriortibial artery, with the nervespread over the back partof the pouch ; the sac isentirely obliterated by con-centric layers of tibr ne,growing paler towards thesurface. (St. Georges Museum,i\ 41.) STATISTICS OF ANEUEISiM. 385 rism, though apparently of exactly the same nature as that liningthe arteries, differs from it in not presenting any epithelium. Thisso-called membrane is in fact the condensed external layer of thecoagulum, similar to that which forms on the surface of old clots Fra. 92.
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