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Show M". . -.,.._..,.,,..__,.,,,,,.._F_ > m»? 4 -. ,. afit's. Origin of tbe Lacteals and Lympb Origin (3/ the Lm‘lmls and Lympbdlit‘s. vicinity become inflamed, and supdiseased, the lymphatic glands in their This circumstance proves that the parts. soft purate as in the diseases of this it may be objected, that the To lymphatics arise also from the bones. or less or inflammation of their substance; and on all these occasions have been induced to bel'sve that the lymphatics arose from the internal surface of 50 ut the soft parts participating more bones are never diseased, witho atics of the soft parts, and not of in the disease, and it may be the lymph but, as I have injected the lympha- the bones, which are thence affected: s, as well as possessed of these vessel tics of bones, and know them to be little weight with it; and the con- but es carri tion objec this parts, the soft al one. Malphigi had an idea, natur more much a , is clusion 1 have drawn these vessels are found in that the lymphatics arose only from follicles; but the least vestigc of a follicle, many parts of the body where there is not they excretory ducts of glands, and They were next said to arise from the than from other parts. certainly do so, but not more particularly from these h I never found tranI have repeatedly injected quicksilver (a fluid whic n and of quadrupeds, sude) into the tubuli lactiferi in the breasts of wome atics at the same time; the and generally found that 1 injected the lymph atics, arising from the intermercury passing into the orifices of the lymph ry likewise, thrown into the ureters, nal surfaces of these ducts.-Mercu s, which were arising from has frequently returned by the lymphatic vessel their internal surfaces. s hepa- The same injection, thrown into the ductu : Haller says, " In heticus, has returned by the lymphatics of the liver dochum impulsum, in lym- cole um duct m per vivu tum argen aut aer pate, um, quam per porta- phatica vaseula venit, ut etiam facilius per eum duct atics are among lymph " The ntur. la rcple rum vcnam, ea pellucida vascu arise from their ex- the vasa vasorum of arteries and veins, and certainly from their internal ternal surfaces. 1 am also fully persuaded that they arise death, the lym_ nt viole some of dying or gled, ls stran cavities, In anima men in general, are phatics about the spleen, and in the cavity of the abdo h I have never seen, on these almost always found turgid with blood, thoug fluid into the cellular memion that of vasat extra s of mark any ions, occas strated the lacteals full brane. In peritoneal inflammation, I have demon of of blood, though in this inflammation there is little or no swelling, course no extravasation of blood into the cellular membrane. I have seen the absorbents of the lungs also loaded with blood, in the peripneumony or arteries and veins. 51 This doctrine is not without its difficulties; for arteries and veins have been distended with injected fluids on many occasions, without the smallest drop of these fluids passing into the lymphatics; and one of the arguments, by which the origin of the lymphatics from surfaces On is supported, is, that they cannot be injected from arteries or veins. conversant in the other hand, there is no anatomist, who has been at all have injecting arteries and veins, but on some occasion or another must no- found, that from these he had also injected the lymphatics. " Ccrte vasa cffuso, vimus," says Haller, " nulla arteria fracta, nullo liquore extra repletamen per arterias, vasa lymphatica, ipsumque ductum thoracicum tum fuissc." I have injected the thoracic duct, and many of its branches, say whether from the umbilical vein, in children. I do not pretend to this was from the arteries or veins, for, in this way of injecting, the ductus venosus foramen ovale and ductus arteriosus being all open, both arteries peritoneeum and veins are injected at the same time. On the process of the I inflated the abof the porpoise, through which the spermatic vessels run, here it sorbents from the veins with the gentlest breath I could blow: But connecuncommon sortie be may there animal this in that maybe objected, tion between red veins and absorbent vessels. I cannot say, that there may not be such connection: but I strongly suspect that there is not. Professor et ipsum Mekel says, " Bis, hat: ctiam praeterita hycme, vasa lymphatiea, ductum thoracicum, ex venis rcplevi." If lymphatics, it may be said, arise from arteries and veins, why do we To this I renit oftcncr inject them from these vessels in the dead body? yet we count ply, the veins are certainly continued front the arteries, and fluid it a lucky injection, if we fill the veins from the arteries, unless the injected is a very subtile one, and such as does not quickly coagulate; the we can frequently, by injecting oil of turpentine into the arteries, fill veins, but we cannot tell whether this happens from the oil of turpentine passing through the capillaries, Or by transudation, as this fluid is very apt to transude. Quicksilver often returns by the veins, and, as it never the transndes, we are more certain of the manner in which it passes; but II 2 quick- |