. On disorders of digestion, their consequences and treatment . oprevent any accumulation from taking place. * I quote from a lecture I heard him deliver to his cla^s iu Vienna in the wintersession, 1867-68. EXUDATION OF LYMPH. 337 Dropsy then does not occur except we have increased outflow oflymph into the tissues in addition to an interference with itsremoval by the veins or lymphatics. We have now to consider the conditions which affect the supplypipe in the illustration with which we commenced, or, in otherwords, the conditions which increase and diminish the exudationof lymph from the cap
. On disorders of digestion, their consequences and treatment . oprevent any accumulation from taking place. * I quote from a lecture I heard him deliver to his cla^s iu Vienna in the wintersession, 1867-68. EXUDATION OF LYMPH. 337 Dropsy then does not occur except we have increased outflow oflymph into the tissues in addition to an interference with itsremoval by the veins or lymphatics. We have now to consider the conditions which affect the supplypipe in the illustration with which we commenced, or, in otherwords, the conditions which increase and diminish the exudationof lymph from the capillaries into the lymph spaces. The first ofthese is increased supply of blood from dilatation of the arteriessupplying a part. I have already mentioned that, in Ranviers experiment of tyingtlie vena cava in a dog, the mere stoppage of the venous circula-tion does not always produce oedema of the legs, the lymph whichis exuded from the cajDillaries being removed either by collateral l//;50-MoroR— NERVES / LICATUR£f--T LYMPHATICS-- SciAin: _i_ f lAar£R/£s. -Diagram of Ranviers experiment. venous circulation or by the lymphatics. The case, however, isusually different when, in addition to the ligature of the venacava, the sciatic nerve is divided on one side. In consequence ofthe division the vessels dilate, more blood pours into the limb,more lymph is exuded into the tissues, and the limb with adivided nerve swells up enormously, while the other remains of itsnormal size, although the venous circulation is equally arrested in z 338 PATHOLOGY OF DROPSY. both. That this accumulation of lymph in the tissues of the leg 13due to paralysis of the vaso-motor and not of the motor nerves of thelimb is proved by dividing on the one side the motor roots of thesciatic and on the other the vaso-motor roots. When the sciatictrunk is divided, there is of course both a vaso-motor and motorparalysis in the limb, because the vaso-motor and motor nerveshave been alike divided, and we get the
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