. Lectures on surgical pathology : delivered at the Royal College of Surgeons of England. his : for, to achieve the construction of such an arch, it must springAvith due adjustment from two determined points, and then its flanksmust be commensurately raised, and these, as with mutual attraction,must approach and meet exactly in the crown. Nothing could accom-plish such a result but forces determining the concurrent developmentof two out-growing vessels. We admire the intellect of the engineer,who, after years of laborious thought, with all the appliances of weightand measure and appropriate ma
. Lectures on surgical pathology : delivered at the Royal College of Surgeons of England. his : for, to achieve the construction of such an arch, it must springAvith due adjustment from two determined points, and then its flanksmust be commensurately raised, and these, as with mutual attraction,must approach and meet exactly in the crown. Nothing could accom-plish such a result but forces determining the concurrent developmentof two out-growing vessels. We admire the intellect of the engineer,who, after years of laborious thought, with all the appliances of weightand measure and appropriate material, can begin at points wide apart,and force through the solid masses of the earth one tunnel, and canwall it in secure from external violence, and strong to bear some pon-derous traffic ; and yet he does but grossly and imperfectly imitate theDivine work of living mechanism that is hourly accomplished in thebodies of the least conspicuous objects of creation—nay, even in thehealing of our casual wounds and sores. * Billroth, op. cit. 162 FORMATION OF NEW BLOODVESSELS. riff. The wonder of the process is, perhaps, in some degree enhanced bythe events that will follow what may seem to be an accident. Whenthe new vessel has begun to project, it sometimes bursts; and the diagram shows what thenwill happen, I have tothank Mr. Quekett for thesketch, which he made whileassisting Mr. Travers in theexaminations already blood-corpuscles that is-sue from the ruptured pouchor diverticulum collect in anuncertain mass within thetissue, like a mere ecchymosis; but, before long, they manifest a defi-nite direction, and the cluster bends towards the line in which the newvessel might have formed, and thus opens into the other portion of thearch, or into some adjacent vessel. For this mode of formation fromvessels, the name of channelling seems more appropriate than that ofout-growth; for it appears certain that the blood-corpuscles here maketheir way in the parenchyma of the
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