The origin of disease : especially of disease resulting from intrinsic as opposed to extrinsic causes : with chapters on diagnosis, prognosis, and treatment . of the cylinder, and as herefocussed to show its surface it appears to be composed of cells which are like whole lies in a lymph-space across which pass minute threads (e) of connective tissuewhich support and hold it in position ; y is the same as x, but with the microscope focussedupon a deeper layer. The upper end is somewhat ill defined, while the lower appears asa capillary with distinct endothelial walls (_/), and ou
The origin of disease : especially of disease resulting from intrinsic as opposed to extrinsic causes : with chapters on diagnosis, prognosis, and treatment . of the cylinder, and as herefocussed to show its surface it appears to be composed of cells which are like whole lies in a lymph-space across which pass minute threads (e) of connective tissuewhich support and hold it in position ; y is the same as x, but with the microscope focussedupon a deeper layer. The upper end is somewhat ill defined, while the lower appears asa capillary with distinct endothelial walls (_/), and outside these walls upon either side isa thick layer of tissue containing cells like epithelium. The lymph-space with connective-tissue threads running across it is distinct in this view, z is a in Fig. 19, and in manyrespects it is like x and y. It is a developing vessel with thick walls which contain epi-thelial cells and is hung by fine threads in a lymph-space. The upper end of the capillary(g) is cut obliquely, and is therefore more elliptical than circular. Below at // the endo-thelial walls are seen where the capillary is cut lengthwise. Fig. THE BLOOD-VESSELS. 51 no blood-vessels in it so large as that depicted, although the richcapillary supply of the villi of the small intestine is well known. Thisvessel, therefore, which is to be classed as an arteriole rather than as acapillary, was developed owing to the conservative tendency of natureto give a blood-supply to all tissues which attain any considerablebulk. The vessel is peculiar not alone in the fact that it existed in themucosa of the colon, but also in its structure and appearance. Thereis no sign of any differentiation into coats, although in a natural arte-riole of such size the three coats would be easily distinguished; nordoes the tissue of which it is composed bear the slightest resemblanceto that of which the walls of healthy vessels are formed. It looksmuch more like epithelium. Another phase of the dev
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