. Lectures on surgical pathology : delivered at the Royal College of Surgeons of England. he dia-^ig- 16. gram is made from what may be seen in the grow-ing parts of the tadpolestail, and it accords withwhat Spallanzani observedof the extension of vesselsinto the substance of thetail when being reproducedafter excision. Mr. Tra-vers* and Mr. Quekettwatched the same processin the new material formedfor the filling up of holes made in the frogs web; and the same is in-dicated in the specimens illustrating the repair of similar wounds whichare in the College, from the Museum of the late Dr. Todd,
. Lectures on surgical pathology : delivered at the Royal College of Surgeons of England. he dia-^ig- 16. gram is made from what may be seen in the grow-ing parts of the tadpolestail, and it accords withwhat Spallanzani observedof the extension of vesselsinto the substance of thetail when being reproducedafter excision. Mr. Tra-vers* and Mr. Quekettwatched the same processin the new material formedfor the filling up of holes made in the frogs web; and the same is in-dicated in the specimens illustrating the repair of similar wounds whichare in the College, from the Museum of the late Dr. Todd, of Brigh-ton. There is, I think, sufiicient reason to suppose that it is theprincipal method for the supply of bloodvessels to any granulations, orsimilar new productions. For, though the process in granulations orin lymph cannot be exactly watched during life, yet every appearanceafter death is consistent with the belief that it is the same as has beentraced in the cases I have cited, and I have never seen any indicationsof either of the other methods of development having * On Inflammation, and the Healing Process. See, also, on a similar formation, Virchowin the Wiirzburg Verhandhmgen, B. i, p. 301. FORMATION OF NEW BLOODVESSELS. 161 The method may be termed that by out-growth from the vessels al-ready formed. Suppose a line or arch of capillary vessel passing belowthe edge or surface of a part to Avhich new material has been superadded.(Fig. 16.) The vessel will first present a dilatation at one point, andcoincidently, or shortly after, at another, as if its wall yielded a littlenear the edge or surface. The slight pouches thus formed, graduallyextend, as blind canals, or diverticula, from the original vessel, stilldirecting their course towards the edge or surface of the new material,and crowded with blood-corpuscles, which are pushed into them fromthe main stream. Still extending, they converge; they meet; the par-tition wall, that is at first formed by the me
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