Manual of human histology . of their structurewill suffice. Thecapillary lymphatics, which, in the three situations in whichthey have hitherto been seen with certainty—in the small intes-tine, the tail of the Tadpole, and the mucous membrane of thetrachea—commence partly with free prolongations, in part in net-works. I have, in a single instance in the tracheal mucous mem-brane in Man, had an opportunity of investigation, and theywere found to consist of a delicate structureless wall, withoutdistinct nuclei after the addition of soda, and having a diameterof 0-003—0005—0Or (fig. 235). The same
Manual of human histology . of their structurewill suffice. Thecapillary lymphatics, which, in the three situations in whichthey have hitherto been seen with certainty—in the small intes-tine, the tail of the Tadpole, and the mucous membrane of thetrachea—commence partly with free prolongations, in part in net-works. I have, in a single instance in the tracheal mucous mem-brane in Man, had an opportunity of investigation, and theywere found to consist of a delicate structureless wall, withoutdistinct nuclei after the addition of soda, and having a diameterof 0-003—0005—0Or (fig. 235). The same structure is pre-sented in the simple lacteals of the intestinal villi in Mammalia,except that these measure 0-012—0026, and have a somewhatthicker wall. The lymphatics discovered by me in the tail ofthe Tadpole (fig. 288), on the contrary, correspond entirely THE LYMPHATICS. 313 with the blood-capillaries, in the occurrence of nuclei on theinner side of the very delicate, structureless membrane, whilst Fig. they differ from them in being furnished with short, jaggedprocesses with prolongations. The diameter of the lymphaticcapillaries in this situation is 0-002—0015, and the two maintrunks of the tail^ like those of the blood-vascular systemitself, have a perfect capillary structure. In what way these capillary lymphatics are changed intothe larger lymphatic canals has not been seen by any one^ or atall events has not been investigated. The finest vessels, whichhave elsewhere come under my observation, had a diameter of^—i—g, and these, except in the thickness of the individuallayers, corresponded in all respects with the larger vessels of1—1|. The latter, the medium-sized lymphatics, present three Fig. 288. Capillary lymphatic from the tail of the Tadpole, x 350 diam.: a, mem-brane ; h, processes formed by it; c, remains of the contents of the cells formingthese vessels, in which nuclei are concealed; e, csecal terminations of the vessels; /one of the
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
