Florence E. Sabin 



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tern of the skin of a pig of that stage, for the ducts at the angle of the 

 jaw are not injected, nor a set of ducts which has just reached the skin 

 over the crest of the ileum. This group of lymphatics is shown farther 

 developed in the next figure. Fig. 3, however, does show the primary 

 set of ducts, that is, those that grow over the back of the head and 

 slioulder completely injected. It brings out clearly the character of 



Fig. 2. The lymphatic system in the skin of a pig 3 cm. long. x3. 



the plexus, the irregularity of the ducts and the fine channels that connect 

 neighboring wide ducts. It shows also the growing sprouts that run out 

 in advance of the plexus to invade new areas of the skin, areas which up 

 to this time have had no lymphatics. 



In Fig. 4, from a pig -i.3 cm. long, the ducts of the primary plexus 



have grown to the median line in the back and, anastomosed with those 



of the other side. The ducts over the face are well injected. The figure 



shows also that the lymphatics for the lower part of the body have 



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