154 DistitrbanCiS of Circidafion. 



coating of the tongue of the mother animal as she licks her 

 young) comes in contact with the umbilical wound, germs capable 

 of causing inflammation may penetrate into the umbilical vein 

 (motile bacteria). These microorganisms rapidly multiply in the 

 clotted blood which occupies the vein, penetrating it possiblv up to 

 the liver where the portal and umbilical veins unite. Thence by 

 the portal current particles of the softened and infected blood clot 



are swept into the substance of 

 , -"'" -;?:t~-^. ^ the liver and give rise there to 



multiple abscess formation. Iso- 

 lated bacteria or small clumps 

 of the germs are carried on- 

 :^*. ward trom the liver through 



f.' *>pv the hepatic venules (in calves 



perhaps directly by way of the 

 ductus Arantii) entering the 

 heart and lungs with the blood 

 ; ' ■■ of the vena cava, with produc- 



tion of further suppurative me- 



Malig-nant hsemorrhagic infarct of the tastases Ul the latter. They may 



uie^cemre. ''°''^- ^"PP^''"^""' *'^ moreover gain access to the 



general circulation (pulmonary 

 veins, left heart, aorta), as the result of which extensive pyogenic 

 foci of inflammation of h?emotogenous embolic origin are produced 

 widely through the body, as in the kidneys, joints, eyes or brain. 

 Another striking example of embolic metastasis is seen in case of 

 tuberculosis, where the tubercle bacilli may be disseminated as 

 above (cf. chapter on tuberculosis). 



lymphatic Thrombosis and Lymphogenous Embolism. The lymph 

 flowing through the lymph vessels, the onward movement of which 

 depends partly upon the pressure with which the fluid transudes 

 through the capillaries, partly upon the compression upon the 

 canals (just as a sponge is squeezed) by the movements and con- 

 tractions of the organs, is also subject to coagulation. For the 

 most part lymph coagulation is caused by the enzymes of in- 

 fectious toxine-producing organisms and b\- lesions of the Ivmph- 

 vessels witli adhesion of necrosing leucocytes and separatioli of 

 fibrin in the spaces. The lymph canals filled with lymph coagula 

 are to be seen as broad strands occupied by the coagulated ma- 

 terial, transparent and jelly-like, as in the interstices of the lung 

 in croupous pneumonia, and strikingly shown, too, in cutaneous 



