. Compendium of histology. Histology. THE LYMPHATICS AND LYMPHATIC GLANDS. 103 we have remaining only the endothelial tube with cells simi- lar to those of the blood-vessels. Here also we still meet with valves and isolated nodal or ampulla-like enlargements. Such vessels remain distinctly demarcated from the immedi- ate neighborhood. The relation of these passages to the blood-vessels varies greatly. For the most part, both vessels simply run alongside of each other. Not unfrequently an arterial branch is accompanied by a pair of lymphatic canals. One may then readily commit an error, namely,
. Compendium of histology. Histology. THE LYMPHATICS AND LYMPHATIC GLANDS. 103 we have remaining only the endothelial tube with cells simi- lar to those of the blood-vessels. Here also we still meet with valves and isolated nodal or ampulla-like enlargements. Such vessels remain distinctly demarcated from the immedi- ate neighborhood. The relation of these passages to the blood-vessels varies greatly. For the most part, both vessels simply run alongside of each other. Not unfrequently an arterial branch is accompanied by a pair of lymphatic canals. One may then readily commit an error, namely, the assump- tion that the blood current is invested by a lymphatic. The latter condition does, indeed, actually take place (Fig. 88, c), although rarely, as many assert. At last, however, the appearance of the lymphatics changes; the outer surface of our vascular cells has now grown firmly together with the surrounding tissues; thus there arises at the first examination the impression of a cavity and cleft. For- merly this was generally considered to be the true interpretation, until the employ- ment of the dilute solution of nitrate of silver opened our eyes (Fig. 98, a). For the examination of the finest termi- nal lymphatics, artificial injections are nat- urally again requisite ; and, indeed, to a higher degree than in the capillaries of the blood passages, where under favorable conditions the colored cells permit the fine tubes to stand out. The lymph, a colorless fluid, poor in cells, does not do this, as is known, and only the chyle ves- sels, overladen with fat, become at times distinctly prominent without any further assistance. But, as is known, the lymphatics have no affluent tube comparable to an artery ; they show merely a capillary divi- sion and effluent canals, comparable to the veins. Filling the latter downwards is, almost without exception, prevented by the resistance of the valves. A highly celebrated modern anatomist, Hyrtl, rendered the service of discove
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